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2007 Oregon Mechanical Specialty Code 



First Printing 



ISBN-13: 978-1-58001-518-9 
ISBN-10: 1-58001-518-2 



Publication Date: January 2007 



COPYRIGHT© 2006 

by 

INTERNATIONAL CODE COUNCIL, INC. 



ALL RIGHTS RESERVED. This 2007 Oregon Mechanical Specialty Code contains substantial copyrighted material from the 
2006 International Mechanical Code, Second Printing, and the 2006 International Fuel Gas Code, Second Printing, which are 
copyrighted works owned by the International Code Council, Inc. Without advance written permission from the copyright owner, 
no part of this book may be reproduced, distributed or transmitted in any form or by any means, including, without limitation, elec- 
tronic, optical or mechanical means (by way of example and not limitation, photocopying, or recording by or in an information stor- 
age retrieval system). For information on permission to copy material exceeding fair use, please contact: Publications, 4051 West 
Flossmoor Road, Country Club Hills, IL 60478-5771. Phone 1-888-ICC-SAFE (422-7233). 

Trademarks: "International Code Council," the "International Code Council" logo and the "International Mechanical Code" are 
trademarks of the International Code Council, Inc. 



PRINTED IN THE U.S.A. 



PREFACE 



Internationally, code officials recognize the need for a modem, up-to-date mechanical code addressing the design and installa- 
tion of mechanical systems emphasizing performance. The International Mechanical Code®, in this 2006 edition, is designed to 
meet these needs through model code regulations that safeguard the public health and safety in all communities, large and small. 

This comprehensive mechanical code establishes minimum regulations for mechanical systems using prescriptive and perfor- 
mance-related provisions. It is founded on broad-based principles that make possible the use of new materials and new mechanical 
system designs. This 2006 edition is fully compatible with all the International Codes® (I-Codes®) published by the International 
Code Council (ICC)®, including the International Building Code®, International Code Council Electrical Code Administrative 
Provisions, International Energy Conservation Code®, International Existing Building Code®, International Fire Code®, Interna- 
tional Fuel Gas Code®, ICC Performance Code®, International Plumbing Code®, International Private Sewage Disposal Code®, 
International Property Maintenance Code®, International Residential Code®, International Wildland-Urban Interface Corfe'^^and 
International Zoning Code®. 

The International Mechanical Code provisions provide many benefits, among which is the model code development process that 
offers an international forum for mechanical professionals to discuss performance and prescriptive code requirements. This forum 
provides an excellent arena to debate proposed revisions. This model code also encourages international consistency in the applica- 
tion of provisions. 



The first edition of the International Mechanical Code (1996) was the culmination of an effort initiated in 1995 by a develop- 
ment committee appointed by the International Code Council (ICC) and consisting of representatives of the three statutory mem- 
bers of the ICC at that time, including: Building Officials and Code Administrators International, Inc. (BOCA), International 
Conference of Building Officials (ICBO) and Southern Building Code Congress International (SBCCI). The intent was to draft a 
comprehensive set of regulations for mechanical systems consistent with and inclusive of the scope of the existing model codes. 
Technical content of the latest model codes promulgated by BOCA, ICBO and SBCCI was utilized as the basis for the development. 
This 2006 edition presents the code as originally issued, with changes reflected in subsequent editions through 2003, and with 
changes approved through the ICC Code Development Process through 2005. A new edition such as this is promulgated every three 
years. 

This code is founded on principles intended to establish provisions consistent with the scope of a mechanical code that ade- 
quately protects public health, safety and welfare; provisions that do not unnecessarily increase construction costs; provisions that 
do not restrict the use of new materials, products or methods of construction; and provisions that do not give preferential treatment to 
particular types or classes of materials, products or methods of construction. 

Adoption 

The International Mechanical Code is available for adoption and use by jurisdictions internationally. Its use within a govern- 
mental jurisdiction is intended to be accomplished through adoption by reference in accordance with proceedings establishing the 
jurisdiction's laws. At the time of adoption, jurisdictions should insert the appropriate information in provisions requiring specific 
local information, such as the name of the adopting jurisdiction. These locations are shown in bracketed words in small capital let- 
ters in the code and in the sample ordinance. The sample adoption ordinance on page v addresses several key elements of a code 
adoption ordinance, including the information required for insertion into the code text. 



The International Mechanical Code is kept up to date through the review of proposed changes submitted by code enforcing offi- 
cials, industry representatives, design professionals and other interested parties. Proposed changes are carefully considered through 
an open code development process in which all interested and affected parties may participate. 

The contents of this work are subject to change both through the Code Development Cycles and the governmental body that 
enacts the code into law. For more information regarding the code development process, contact the Code and Standard Develop- 
ment Department of the International Code Council. 

While the development procedure oiihe. International Mechanical Code assures the highest degree of care, ICC, its members 
and those participating in the development of this code do not accept any liability resulting from compliance or noncompliance with 
the provisions because ICC and its founding members do not have the power or authority to police or enforce compliance with the 
contents of this code. Only the governmental body that enacts the code into law has such authority. 



2007 OREGON MECHANiCAL SPECIALTY CODE 



Letter Designations in Front of Section Numbers 

In each code development cycle, proposed changes to this code are considered at the Code Development Hearings by the ICC 
Plumbing Code Development Committee, whose action constitutes a recommendation to the voting membership for final action on 
the proposed change. Proposed changes to a code section that has a number beginning with a letter in brackets aie considered by a 
different code development committee. For example, proposed changes to code sections that have the letter [B] in front (e.g. [B] 
601.2), are considered by the International Building Code Development Committee at the Code Development Hearing. 

The content of sections in this code that begin with a letter designation are maintained by another code development commit- 
tee in accordance with the following: 

[B]= International Building Code Development Committee; 

[EC]= International Energy Conservation Code Development Committee; 

[FG]= International Fuel Gas Code Development Committee; and 

[F]= International Fire Code Development Committee. 



Marginal Markings 

Solid vertical lines in the margins within the body of the code indicate a technical change from the requirements of the 2003 
edition. Deletion indicators (^) are provided in the margin where a paragraph or item has been deleted. > indicates IMC and 
IFGC model code language deleted by Oregon. Appendix C is IFGC model code language with some modification by Oregon. 
JIThis symbol indicates a State of Oregon amendment has been made to the International Code. Minor changes, such as section 
renumbering and removal of references to International Codes are not indicated with a double rule in the margin. 



2007 OREGON MECHANICAL SPECIALTY CODE 



TABLE OF CONTENTS 



CHAPTER 1 ADMINISTRATION 1 

Section 

101 General 1 

102 Applicability 1 

103 Department of Mechanical Inspection 2 

104 Duties and Powers of the Code Official 3 

105 Approval 3 

106 Permits 4 

107 Inspections and Testing 5 

108 Violations 7 

109 Means of Appeal 9 

CHAPTER 2 DEFINITIONS ...,,.... 11 

Section 

201 General 11 

202 General Definitions 11 

CHAPTER 3 GENERAL REGULATIONS 21 

Section 

301 General 21 

302 Protection of Structure 22 

303 Equipment and Appliance Location 23 

304 Installation 23 

305 Piping Support 26 

306 Access and Service Space 26 

307 Condensate Disposal 27 

308 Clearance Reduction 28 

CHAPTER 4 VENTILATION .................. 31 

Section 

401 General 31 

402 Natural Ventilation 31 

403 Mechanical Ventilation 31 

404 Enclosed Parking Garages 34 

405 Systems Control 34 

406 Ventilation of Uninhabited Spaces 34 

CHAPTER 5 EXHAUST SYSTEMS 35 

Section 

501 General 35 

502 Required Systems 35 

503 Motors and Fans 41 

504 Clothes Dryer Exhaust 42 



505 Domestic Kitchen Exhaust Equipment 42 

506 Commercial Kitchen Hood Ventilation 

System Ducts And Exhaust Equipment 43 

507 Commercial Kitchen Hoods 46 

508 Commercial Kitchen Makeup Air 48 

509 Fire Suppression Systems 49 

510 Hazardous Exhaust Systems 49 

511 Dust, Stock and Refuse Conveying Systems .... 51 

512 Subslab Soil Exhaust Systems 52 

513 Smoke Control Systems 52 

5 14 Energy Recovery Ventilation Systems 56 

CHAPTER 6 DUCT SYSTEMS ...........,,..,, 57 

Section 

601 General 57 

602 Plenums 57 

603 Duct Construction and Installation 58 

604 Insulation 60 

605 Air Filters 61 

606 Smoke Detection Systems Control 61 

607 Ducts and Transfer Openings 62 

CHAPTER 7 COMBUSTION AIR .............. 67 

Section 

701 General 67 

702 Indoor Air 67 

703 Outdoor Air 68 

704 Combined Use of Indoor and 

Outdoor Air (Condition 1) 68 

705 Combined Use of Indoor and 

Outdoor Air (Condition 2) 68 

706 Forced Combustion Air Supply 68 

707 Direct Connection 69 

708 Combustion Air Ducts 69 

709 Opening Obstructions 69 

710 Opening Location and Protection 69 

CHAPTER 8 CHIMNEYS AND VENTS ......... 71 

Section 

801 General 71 

802 Vents 72 

803 Connectors 73 

804 Direct-vent, Integral Vent, Mechanical 

Draft Systems 74 



2007 OREGON MECHANICAL SPECIALTY CODE 



TABLE OF CONTENTS 



805 Factory-built Chimneys 75 

806 Metal Chimneys 76 

CHAPTER 9 SPECIFIC APPLIANCES, 

FIREPLACES AND SOLID FUEL= 
BURNING EQUIPMENT ..........11 

Section 

901 General 77 

902 Masonry Fireplaces 77 

903 Factory-built Fireplaces 77 

904 Pellet Fuel-burning Appliances 77 

905 Fireplace Stoves and Room Heaters 77 

906 Factory-built Barbecue Appliances 77 

907 Incinerators and Crematories 77 

908 Cooling Towers, Evaporative 

Condensers and Fluid Coolers 77 

909 Vented Wall Furnaces 78 

910 Floor Furnaces 78 

91 1 Duct Furnaces 78 

912 Infrared Radiant Heaters 78 

913 Clothes Dryers 78 

914 Sauna Heaters 79 

915 Engine and Gas Turbine-powered 

Equipment and Appliances 79 

916 Pool and Spa Heaters 79 

917 Cooking Appliances 79 

918 Forced-air, Warm-air Furnaces 79 

919 Conversion Burners 80 

920 Unit Heaters 80 

921 Vented Room Heaters 80 

922 Kerosene and Oil-fired Stoves 80 

923 Small Ceramic Kilns 81 

924 Stationary Fuel Cell Power Plants 81 

925 Masonry Heaters 81 

926 Gaseous Hydrogen Systems 81 

927 Wood Stoves 81 

CHAPTER 10 BOILERS, WATER HEATERS 

AND PRESSURE VESSELS. , . . , o o , 83 

Section 

1001 General 83 

1002 Water Heaters 83 

1003 Pressure Vessels 83 

1004 Definitions 83 

1005 Permits Required 83 

1006 Detailed Requirements 84 



1007 Expansion Tanks 84 

1008 Safety or Relief Valve Discharge 84 

1009 Gas-pressure Regulators 84 

1010 Clearance for Access 84 

101 1 Boiler Room Enclosures 84 

1012 Floors 84 

1013 Chimneys or Vents 84 

1014 Drainage 84 

1015 Fuel Supply Piping 84 

1016 Air for Combustion and Ventilation 84 

1017 Steam and Waterpiping 84 

CHAPTER 11 REFRIGERATIONo o .. ..... o .. o = . o 85 

Section 

1 101 General 85 

1 102 System Requirements 85 

1 103 Refrigeration System Classification 86 

1104 System Application Requirements 90 

1 105 Machinery Room, General Requirements 91 

1106 Machinery Room, Special Requirements 92 

1 107 Refrigerant Piping 93 

1 108 Field Test 94 

CHAPTER 12 HYDRONIC PIPING ........... ...95 

Section 

1201 General 95 

1202 Material 95 

1203 Joints and Connections 96 

1204 Pipe Insulation 97 

1205 Valves 97 

1206 Piping Installation 97 

1207 Transfer Fluid 98 

1208 Tests 98 

1209 Embedded Piping 98 

CHAPTER 13 FUEL OIL PIPING 

AND STORAGE ... ............... 99 

Section 

1301 General 99 

1302 Material 99 

1303 Joints and Connections 99 

1304 Piping Support 100 

1305 Fuel Oil System Installation 100 

1306 Oil Gauging 101 

1307 Fuel Oil Valves 101 



VD 



2007 OREGON MECHANICAL SPECIALTY CODE 



TABLE OF CONTENTS 



1308 Testing 101 

CHAPTER 14 SOLAR SYSTEMS. .............. 103 

Section 

1401 General 103 

1402 Installation 103 

1403 Heat Transfer Fluids 103 

1404 Materials 104 

CHAPTER IS REFERENCED STANDARDS ..... 105 

APPENDIX A COMBUSTION AIR OPENINGS AND 
CHIMNEY CONNECTOR 
PASSTHROUGHS .............. Ill 

APPENDIX B RECOMMENDED PERMIT 

FEE SCHEDULE ................ 115 

APPENDIX C FUEL GAS .................... 117.1 

Appendix 

C-A Sizing and Capacities of Gas Piping 117.117 

C-B Sizing of Venting Systems Serving Appliances 
Equipped with Draft Hoods, Category I 
Appliances, and Appliances Listed for 
Use with Type B Vents 117.127 

C-C Exit Terminals of Mechanical Draft and 

Direct-vent Venting Systems 117.137 

C-D Recommended Procedure for Safety 
Inspection of an Existing Appliance 
Installation 117.139 



FOR CHAPTERS 1--14 .................. 118 

X FOR APPENDIX C. .................... 123 



2007 OREGON MECHANICAL SPECIALTY CODE 



2007 OREGON MECHANICAL SPECIALTY CODE 



CHAPTER 1 

ADMINISTRATION 



> 



SECTION 101 
GENERAL 

101.1 Title. These regulations shall be known as the Oregon 
Mechanical Specialty Code, hereinafter referred to as "this 
code." 

1®1.2 Scope. This code shall regulate the design, installation, 
alteration and inspection of mechanical systems that are per- 
manently installed, and those systems utilized to provide con- 
trol of environmental conditions and related processes within 
buildings. This code shall also regulate those mechanical sys- 
tems, system components, equipment and appliances specifi- 
cally addressed herein. Mechanical equipment or systems not 
specifically addressed in this code shall be approved by the 
code official in accordance with Section 105.2. The installation 
of fuel gas distribution piping and equipment, fuel gas-fired 
appliances and fuel gas-fired appliance venting systems are 
found in Appendix C. 

Exception: Structures regulated under the Oregon Residen- 
tial Specialty Code. 



ORS 455.020(1) is not part of this code but is reproduced here for 
the reader's convenience: 

455.020 Purpose; scope of application. (1) This chapter is en- 
acted to enable the Director of the Department of Consumer and 
Business Services to promulgate a state building code to govern the 
construcrion, reconstruction, alteration and repair of buildings and 
other structures and the installation of mechanical devices and 
equipment therein, and to require the correction of unsafe condi- 
tions caused by earthquakes in exisdng buildings. The state build- 
ing code shall establish uniform performance standards providing 
reasonable safeguards for health, safety, welfare, comfort and secu- 
rity of the residents of this state who are occupants and users of 
buildings, and will provide for the use of modem methods, devices, 
materials, techniques and practicable maximum energy conserva- 
tion. 



101.2.1 Appendices. Provisions in the appendices shall not 
I I apply unless specifically adopted. The State of Oregon does 
1 I not adopt Appendices A and B. Appendix C is adopted. 

101.3 Intent. The purpose of this code is to provide minimum 
standards to safeguard life or limb, health, property and public 
welfare by regulating and controlling the design, construction, 

I I installation and location of mechanical systems. 

101.4 Severability. If a section, subsection, sentence, clause or 
I I phrase of this code is, for any reason, held to be invahd, such 

decision shall not affect the validity of the remaining portions 
of this code. 



SECTION 102 
APPLICABILITY 

102.1 General. The provisions of this code shall apply to all 
matters affecting or relating to structures and premises, as set 
forth in Section 101 . Where, in a specific case, different sections 
of this code specify different materials, methods of construction 
or other requirements, the most restrictive shall govern. 



Note: Boilers and pressure vessels are also regulated by the State of 
Oregon Boiler and Pressure Law (ORS 480.5 10 to 480.670). 



102.2 Existing installations. Except as otherwise provided for 
in this chapter, a provision in this code shall not require the 
removal, alteration or abandonment of, nor prevent the contin- 
ued utilization and maintenance of an existing mechanical sys- 
tem lawfully in existence at the time of the adoption of this 
code. 

102.3 Maintenance. Not adopted by the State of Oregon. 

102.4 Additions, alterations or repairs. Additions, alter- 
ations, renovations or repairs to a mechanical system shall con- 
form to that required for a new mechanical system without 
requiring the existing mechanical system to comply with all of 
the requirements of this code. Additions, alterations or repairs 
shall not cause an existing mechanical system to become 
unsafe, hazardous or overloaded. 

Minor additions, alterations, renovations and repairs to 
existing mechanical systems shall meet the provisions for new 
construction, unless such work is done in the same manner and 
arrangement as was in the existing system, is not hazardous and 
is approved. 

102.5 Change In occupancy. No change shall be made in the 
occupancy of any structure which will subject the structure to 
any special provision of this code applicable to the new occu- 
pancy without approval. The code official shall certify that 
such structure meets the intent of the provisions of the Oregon 
Structural Specialty Code. 

102.6 Historic buildings. The provisions of this code relating to 
the construction, alteration, repair, enlargement, restoration, 
relocation or moving of buildings or structures shall not be man- 
datory for existing buildings or structures identified and classi- 
fied by the state or local jurisdiction as historic buildings when 
such buildings or structures are judged by the code official to be 
safe and in the public interest of health, safety and welfare 
regarding any proposed construction, alteration, repair, enlarge- 
ment, restoration, relocation or moving of buildings. 

102.7 Moved buildings. Except as determined by Section 
102.2, mechanical systems that are a part of buildings or struc- 



II 



I I 



2007 OREGON MECHANICAL SPECIALTY CODE 



tures moved into or within the jurisdiction shall comply with 
the provisions of this code for new installations. See ORS 
455.410 for moved buildings. 



> 



> 



ORS 455.410 is not a part of this code but is reproduced here for the 
reader's convenience: 

455.410 Relocated buildings, substantial complknce required; 

permits. 

( 1 ) Existing buildings or structures which are removed from their 
foundation and relocated to another site within this state shall be 
in substantial compliance as defined in subsections (2) and (3) of 
this section. 

(2) "Substantial compliance" means compliance with local con- 
struction codes in effect as of the original permit date of the build- 
ing or structure, or where there was no permitting required at the 
time of original construction, with basic health and safety stan- 
dards, as described in the closest dated Uniform Housing Code, 
as published by the International Conference of Building Offi- 
cials as of the date of construction. Only the insulation, overhead 
and underneath the structure, shall be upgraded to the current 
insulation requirements of the state building code, or to the maxi- 
mum extent possible subject to the design of the structure. Noth- 
ing in this statute shall be construed to mean that all heating, 
plumbing and electrical systems shall be replaced with systems 
meeting current standards for new construction, except that any 
life-threatening deficiencies in those systems shall be repaired, 
notwithstanding that the cost of rehabilitation may exceed 50 per- 
cent of the value of the structure before rehabilitation. 

(3) All foundation and basement construction on the structure and 
any remodeling at the new location shall be constructed subject to 
all applicable local current building and safety codes, or where 
none exist, with the applicable standards as described in the Uni- 
form Housing Code described in subsection (2) of this section. 

(4) All moved houses shall be provided with either battery-oper- 
ated or hard-wired smoke detection devices located in accor- 
dance with the provisions of the state building code. 

(5) Nothing in this section is intended to permit any person to move 
a structure unless the person first consults with the appropriate 
building inspection authority and obtains all required permits. 



102.8 Referenced codes and standards. 

IO2.80I Statutory references. This code is adopted pursuant 
to Oregon Revised Statutes. Where in any specific case this 
code and the statutes specify different requirements, the statute 
shall govern. Statutes related to this code are ORS 455.010 
through 455.897 and ORS 447.210 through 447.310. 

102.8.2 Referenced standards. The standards referenced 
herein shall be those that are listed in Chapter 1 5 and such stan- 
dards shaU be considered as part of the requirements of this 
code to the prescribed extent of each such reference. Where 
differences occur between provisions of this code and the ref- 
erenced standards, the provisions of this code shall apply. 



Statutes referenced may be obtained from the Building Codes Divi- 
sion, P.O. Box 14470, Salem OR 97309-0404. 



SECTION 103 
DEPARTMENT OF MECHANICAL INSPECTION 

103ol Liability. See ORS 30.265 for regulations relating to lia- 
bihty. 



ORS 30.265 is not a part of this code but is reproduced here for the 
reader's convenience. 

ORS 30.265 Scope of liability of public body, officers, employ- 
ees and agents; liability in nuclear incident. 

(1) Subject to the limitations of ORS 30.260 to 30.300, every pub- 
lic body is subject to action or suit for its torts and those of its offi- 
cers, employees and agents acting within the scope of their 
employment or duties, whether arising out of a governmental or 
proprietary function or while operating a motor vehicle in a 
ridesharing arrangement authorized under ORS 276.598. The 
sole cause of action for any tort of officers, employees or agents 
of a public body acting within the scope of their employment or 
duties and eligible for representation and indemnification under 
ORS 30.285 or 30.287 shall be an action against the public body 
only. The remedy provided by ORS 30.260 to 30.300 is exclusive 
of any other action or suit against any such officer, employee or 
agent of a pubhc body whose act or omission within the scope of 
the officer's, employee's or agent's employment or duties gives 
rise to the action or suit. No other form of civil action or suit shall 
be permitted. If an action or suit is filed against an officer, 
employee or agent of a public body, on appropriate motion the 
pubhc body shall be substituted as the only defendant. 

(2) Every public body is immune from hability for any claim for 
injury to or death of any person or injury to property resulting 
from an act or omission of an officer, employee or agent of a pub- 
lic body when such officer, employee or agent is immune from 
liability. 

(3) Every public body and its officers, employees and agents act- 
ing wi thin the scope of their employment or duties, or while oper- 
ating a motor vehicle in a ridesharing arrangement authorized 
under ORS 276.598, are immune from liability for: 

(a) Any claim for injury to or death of any person covered by 
any workers' compensation law. 

(b) Any claim in connection with the assessment and collec- 
tion of taxes. 

(c) Any claim based upon the performance of or the failure to 
exercise or perform a discretionary function or duty, whether 
or not the discretion is abused. 

(d) Any claim that is limited or barred by the provisions of any 
other statute, including but not limited to any statute of ulti- 
mate repose. 

(e) Any claim arising out of riot, civil commotion or mob 
action or out of any act or omission in connection witli the pre- 
vention of any of the foregoing. 

(f) Any claim arising out of an act done or omitted under 
ap]3arent authority of a law, resolution, rule or regulation that 
is unconstitutional, invalid or inapplicable except to the extent 
that they would have been liable had the law, resolution, rule 
or regulation been constitutional, valid and applicable, unless 
such act was done or omitted in bad faith or with malice. 

(4) Subsection (1) of this section apphes to any action of any offi- 
cer, employee or agent of the state relating to a nuclear incident, 
whether or not the officer, employee or agent is acting within the 
scope of employment, and provided the nuclear incident is cov- 
ered by an insurance or indemnity agreement under 42 U.S.C. 
2210. 

(5) Subsection (3)(c) of this section does not apply to any discre- 
tionary act that is found to be the cause or partial cause of a 
nuclear incident covered by an insurance or indemnity agreement 
under the provisions of 42 U.S.C. 2210, including but not limited 
to road design and route selection. [1967 c.627 §§2,3,10; 1969 
c.429 §1; 1975 c.609 §12; 1977 c.823 §2; 1981 c.490 §4; 1985 
c.731 §31; 1987 c.705 §7; 1991 c.861 §1; 2005 c.22 §19]. 



2007 OREGON MECHANICAL SPECIALTY CODE 



ADMINISTRATION 



DUTIES AMD POWI 



1^, 



> 

I I 



by a muEkipality 
noted below, this 



1(0)4.1 GeMerafl. The code official shall enforce the provisions 
of this code and shall act on any question relative to the installa- 
tion, alteration or repair of mechanical systems, except as oth- 
erwise specifically provided for by statutory requirements. 

Note; Section 104.2 is not adopted by the State of Oregon. 



The code official shall have 
authority as necessary in the interest of public health, safety 
and general welfare, to adopt and promulgate rules and regula- 
tions; to interpret and implement the provisions of this code; to 
secure the intent thereof; and to designate requirements appli- 
cable because of local climatic or other conditions. Such rules 
shall not have the effect of waiving structural or fire perfor- 
mance requirements specifically provided for in this code, or of 
violating accepted engineering methods involving public 
safety. 



The code official shall 
receive applications and issue permits for the installation and 
alteration of mechanical systems, inspect the premises for 
which such permits have been issued and enforce compliance 
with the provisions of this code. 



The code official shall make all of the 
required inspections. All reports of such inspections shall be in 
writing and be certified by a responsible officer of such 
approved agency or by the responsible individual. 



Whenever it is necessary to make an 
inspection to enforce the provisions of this code, or whenever 
the code official has reasonable cause to believe that there 
exists in a building or upon any premises any conditions or vio- 
lations of this code which make the building or premises 
unsafe, insanitary, dangerous or hazardous, the code official 
shall have the authority to enter the building or premises at all 
reasonable times to inspect or to perform the duties imposed 
upon the code official by this code. If such building or premises 
is occupied, the code official shall present credentials to the 
occupant and request entry. If such building or premises is 
unoccupied, the code official shall first make a reasonable 
effort to locate the owner or other person having charge or con- 
trol of the building or premises and request entry. If entry is 
refused, the code official has recourse to every remedy pro- 
vided by law to secure entry. 

When the code official has first obtained a proper inspection 
warrant or other remedy provided by law to secure entry, an 
owner or occupant or person having charge, care or control of 
the building or premises shall not fail or neglect, after proper 
request is made as herein provided, to promptly permit entry 
therein by the code official for the purpose of inspection and 
examination pursuant to this code. 



orders. The code official shall issue all nec- 
essary notices or orders to ensure compliance with this code. 

1(0)4.7 Departmeeit records. The code official shall keep offi- 
cial records as dictated by OAR 166-150-0020 where a county 
has jurisdiction; OAR 166-200-0025 where a city has jurisdic- 



tion; and OAR Division 166, Chapter 300 for the cities and 
counties where the State of Oregon has jurisdiction. ^ 

SECTION 105 
APPROVAL 

Note: ORS 455.060 provides for state rulings on acceptable mate- 
rials, design and methods of construction. When a ruling has been 
issued, ORS 455.060(4) applies. 



ORS 455.060(4) is not part of this code but is reproduced here 

for the reader's convenience: 

455.060 Rulings on acceptability of material, design or method 

of construction; effect of approval. 

(4) A building official or inspector shall approve the use of any 
material, design or method of construction approved by the direc- 
tor pursuant to this section if the requirements of all other local 
ordinances are satisfied. 



105.1 Modifications. Whenever there are practical difficulties 
involved in carrying out the provisions of this code, the code 
official shall have the authority to grant modifications for indi- 
vidual cases, provided the code official shall first find that spe- 
cial individual reason makes the strict letter of this code 
impractical and the modification is in compliance with the 
intent and purpose of this code and does not lessen health, life 
and fire safety requirements. The details of action granting 
modifications shall be recorded and entered in the files of the 
mechanical inspection department. 

105.2 Alternative materials, methods, equipment and 

appliances. The provisions of this code are not intended to pre- 
vent the installation of any material or to prohibit any method 
of construction not specifically prescribed by this code, pro- 
vided that any such alternative has been approved. An alterna- 
tive material or method of construction shall be approved 
where the code official finds that the proposed design is satis- 
factory and complies with the intent of the provisions of this 
code, and that the material, method or work offered is, for the 
purpose intended, at least the equivalent of that prescribed in 
this code in quality, strength, effectiveness, fire resistance, 
durability and safety. 

105.3 Required testing. Whenever there is insufficient evi- 
dence of compliance with the provisions of this code, or evi- 
dence that a material or method does not conform to the 
requirements of this code, or in order to substantiate claims for 
alternative materials or methods, the code official shall have the 
authority to require tests as evidence of compliance to be made 
at no expense to the jurisdiction. 

105.3.1 Test methods. Test methods shall be as specified in 
this code or by other recognized test standards. In the 
absence of recognized and accepted test methods, the code 
official shall approve the testing procedures. 

105.3.2 Testing agency. All tests shall be performed by an 
approved agency. 

105.3.3 Test reports. Reports of tests shall be retained by 
the code official for the period required for retention of pub- 
lic records. 



2007 OREGOfM WIECHAMICAL SPECIALTY CODE 



ADW1IMBSTRATI10N 



WSA Material, equipment and appliance reuseo Materials, 
equipment, appliances and devices shall not be reused unless 
such elements have been reconditioned, tested and placed in 
good and proper working condition and approved. 



SECTION 106 
PERMITS 

I I Note: Unless amended by a municipality, under authority of ORS 
I I 455.020, the following shall apply. 

106.1 When required. An owner, authorized agent or contrac- 
tor who desires to erect, install, enlarge, alter, repair, remove, 
convert or replace a mechanical system, the installation of 
which is regulated by this code, or to cause such work to be 
done, shall first make apphcation to the code official and obtain 
I I the required permit for the work [see ORS 455.020(2)]. 

Exception; Where equipment and appliance replacements 
or repairs must be performed in an emergency situation, the 
permit application shall be submitted within the next work- 
ing business day of the department of mechanical inspec- 
tion. 

106o2 Permits not required. Permits shall not be required for 
the following: 

1. Portable heating appliances; 

2. Portable ventilation appliances and equipment; 

3. Portable cooling units; 

4. Steam, hot water or chilled water piping within any heat- 
ing or cooling equipment or appliances regulated by this 
code; 

5 . The replacement of any minor part that does not alter the 
approval of equipment or an appliance or make such 
equipment or appliance unsafe; 

6. Portable evaporative coolers; 

7. Self-contained refrigeration systems that contain 10 
pounds (4.5 kg) or less of refrigerant, or that are actuated 
by motors of 1 horsepower (0.75 kW) or less; and 

8. Portable fuel cell appliances that are not connected to a 
fixed piping system and are not interconnected to a 
power grid. 

Exemption from the permit requirements of this code shall 
not be deemed to grant authorization for work to be done in vio- 
lation of the provisions of this code or other laws or ordinances 
of this jurisdiction. 

I I Note: Unless amended by a municipality, under authority of ORS 
1 I 455.020, the following shall apply. 

106.3 Application for permit. Each application for a permit, 
with the required fee, shall be filed with the code official on a 
form furnished for that purpose and shall contain a general 
description of the proposed work and its location. The applica- 
tion shall be signed by the owner or an authorized agent. The 
permit application shall indicate the proposed occupancy of all 
parts of the building and of that portion of the site or lot, if any, 
not covered by the building or structure and shall contain such 
other information required by the code official. 



Exception: For those inspecting jurisdictions that may have 
adopted a master permit and/or minor label program under 
OAR Chapter 918, Division 100, different requirements 
may also apply. 

106.3.1 Construction documents. Construction docu- 
ments, engineering calculations, diagrams and other data 
shall be submitted in two or more sets with each application 
for a permit. The code official shall require construction 
documents, computations and specifications to be prepared 
and designed by a registered design professional when 
required by state law. Construction documents shall be ^ 
drawn to scale and shall be of sufficient clarity to indicate 

the location, nature and extent of the work proposed and 
show in detail that the work conforms to the provisions of 
this code. Construction documents for buildings more than 
two stories in height shall indicate where penetrations will 
be made for mechanical systems. ^ 

Exception: The code official shall have the authority to 
waive the submission of construction documents, calcu- 
lations or other data if the nature of the work applied for 
is such that reviewing of construction documents is not 
necessary to determine compliance with this code. 

106.3.2 Time limitation of application. An application for 
a permit for any proposed work shall be deemed to have 
been abandoned 180 days after the date of filing, unless such 
application has been pursued in good faith or a permit has 
been issued; except that the building official is authorized to 
grant one or more extensions of time for additional periods 
not exceeding 90 days each. The extension shall be 
requested in writing and justifiable cause demonstrated. 

Note: Unless amended by a municipality, under authority of ORS 
455.020, the following shall apply. 

106.4 Permit issuance. The application, construction docu- 
ments and other data filed by an applicant for a permit shall be 
reviewed by the code official. If the code official finds that the 
proposed work conforms to the requirements of this code and 
all laws and ordinances applicable thereto, and that the fees 
specified in Section 106.5 have been paid, a permit shall be 
issued to the applicant. 

Note: For those inspecting jurisdictions that may have adopted a 
master permit and/or minor label program different require- 
ments may also apply. 

106.4.1 Approved construction documents. When the 
code official issues the permit where construction docu- 
ments are required, the construction documents shall be 
endorsed in writing and stamped "APPROVED." Such 
approved construction documents shall not be changed, 
modified or altered without authorization from the code 
official. Work shall be done in accordance with the 
approved construction documents. 

The code official shall have the authority to issue a permit 
for the construction of part of a mechanical system before 
the construction documents for the entire system have been 
submitted or approved, provided adequate information and 
detailed statements have been filed complying with all perti- 
nent requirements of this code. The holder of such permit 
shall proceed at his or her own risk without assurance that 
the permit for the entire mechanical system will be granted. 



2007 OREGON MECHANICAL SPECIALTY CODE 



ADMINISTRATION 



> 



>.4,2 Validity. The issuance of a permit or approval of 
construction documents shall not be construed to be a per- 
mit for, or an approval of, any violation of any of the provi- 
sions of this code or of other ordinances of the jurisdiction. 
A permit presuming to give authority to violate or cancel the 
provisions of this code shall be invalid. 

The issuance of a permit based upon construction docu- 
ments and other data shall not prevent the code official from 
thereafter requiring the correction of errors in said construc- 
tion documents and other data or from preventing building 
operations from being carried on thereunder when in viola- 
tion of this code or of other ordinances of this jurisdiction. 



.4,3 ExpiratioKo Every permit issued by the code offi- 
cial under the provisions of this code shall expire by limita- 
tion and become null and void if the work authorized by 
such permit is not commenced within 180 days from the 
date of such permit, or if the work authorized by such permit 
is suspended or abandoned at any time after the work is 
commenced for a period of 180 days. Before such work 
recommences, a new permit shall be first obtained and the 
fee, therefore, shall be one-half the amount required for a 
new permit for such work, provided no changes have been 
made or will be made in the original construction docu- 
ments for such work, and provided further that such suspen- 
sion or abandonment has not exceeded one year. 



i.4.4 Extensions. A permittee holding an unexpired per- 
mit shall have the right to apply for an extension of the time 
within which the permittee will commence work under that 
permit when work is unable to be commenced within the 
time required by this section for good and satisfactory rea- 
sons. The code official shall extend the time for action by the 
permittee for a period not exceeding 180 days if there is rea- 
sonable cause. A permit shall not be extended more than 
once. 

106.4.5 Suspension or revocation of permit. The code 
official shall revoke a permit or approval issued under the 
provisions of this code in case of any false statement or mis- 
representation of fact in the application or on the construc- 
tion documents upon which the permit or approval was 
based. 



5.4.6 Retention of construction documents. One set of 
construction documents shall be retained by the code offi- 
cial for a period of not less than that dictated by OAR 
166-150-0020 where a county has jurisdiction; OAR 
166-200-0025 where a city has jurisdiction; and OAR Divi- 
sion 166, Chapter 300 for the jurisdictions where the State 
of Oregon has jurisdiction. One set of approved construc- 
tion documents shall be returned to the applicant, and said 
set shall be kept on the site of the building or job at all times 
during which the work authorized thereby is in progress. 

Note: Unless amended by a municipality, under authority of ORS 
455.020 (4), the foUowing shall apply. 

106.5 Fees. A permit shall not be issued until the fees pre- 
scribed in Section 106.5.2 have been paid, nor shall an amend- 
ment to a permit be released until the additional fee, if any, due 
to an increase of the mechanical system, has been paid. 



106.5.1 Work commencing before permit issuance. Any 

person who commences work on a mechanical system 
before obtaining the necessary permits shall be subject to 
100 percent of the usual permit fee in addition to the 
required permit fees. 

106.5.2 Fee schedule. The fees for mechanical work shall 
be as indicated in the following schedule (see page 7). 

Note: Mechanical permit fees are adopted as fees for the Building 
Codes Division as required by ORS 455.210(2). Oregon munici- 
palities may adopt their own fees according to ORS 455.150 and 

455.210(3). 

Note: Section 105.3 is not adopted by the State of Oregon. 

106.5.3 Fee refunds. The code official shall authorize the 
refunding of fees as follows: 

1 . The full amount of any fee paid hereunder which was 
erroneously paid or collected. 

2. Not more than [SPECIFY percentage] percent of the 
permit fee paid when no work has been done under a 
permit issued in accordance with this code. 

3. Not more than [SPECIFY PERCENTAGE] percent of the 
plan review fee paid when an application for a permit 
for which a plan review fee has been paid is with- 
drawn or canceled before any plan review effort has 
been expended. 

The code official shall not authorize the refunding of any 
fee paid, except upon written application filed by the origi- 
nal permittee not later than 180 days after the date of fee 
payment. 

106.5.4 Plan review fees. When a plan or other data is 
required to be submitted by Section 106.3.1, a plan review 
fee shall be paid at the time of submitting plans and specifi- 
cations for review. The plan review fees for mechanical 
work shall be equal to 25 percent of the total permit fee as set 
forth in Table 1- A. 

106.5.4.1 Separate fees for plan review. The plan 
review fees specified in this section are separate fees 
from the permit fees specified in Section 106.5.2 and are 
in addition to the permit fees. 

106.5.4.2 Incomplete or changed plans. When plans 
are incomplete or changed so as to require additional 
plan review, an additional plan review fee shall be 
charged at the rate shown in Table 1-A. 



SECTION 107 
INSPECTIONS AND TESTING 

107.1 Required inspections and testing. The code official, 
upon notification from the permit holder or the permit holder's 
agent, shall make the following inspections and other such 
inspections as necessary, and shall either release that portion of 
the construction or shall notify the permit holder or the permit 
holder's agent of violations that must be corrected. The holder 
of the permit shall be responsible for the scheduling of such 
inspections. 

1 . Underground inspection shall be made after trenches or 
ditches are excavated and bedded, piping installed, and 



2007 OREGON MECHANSCAL SPECIALTY CODE 



TABLE 1-A 
lECHAMICAL PERMIT FEES 



PERMIT ISSUANCE 


1 . For the issuance of each permit. 


$13.00 


2. For issuing each supplemental permit. 


3.90 


UNIT FEE SCHEDULE 


1 . For the installation or relocation of each forced-air or gravity-type furnace or burner, including ducts and vents attached to : 

such appUance, up to and including 100,000 Btu/h (29.3 kW). , ''^^ 


2. For the installation or relocation of each forced-air or gravity-type furnace or burner, including ducts and vents attached to 
such appliance over 100,000 Btu/h (29.3 kW). 


9.75 


3. For the installation or relocation of each floor furnace, including vent. 


7.80 


4. For the installation or relocation of each suspended heater, recessed wall heater or floor-mounted unit heater. 


7.80 


5. For the installation, relocation or replacement of each appliance vent installed and not included in an appliance permit. 


3.90 


6. For the repair of, alteration of, or addition to each heating appliance, refrigeration unit, cooling unit, absorption unit or each 
heating, cooling, absorption, or evaporative cooling system, including installation of controls regulated by this code. 


7.80 


7. For the installation or relocation of each compressor to and including three horsepower (10.6 kW), or each absorption sys- 
tem to and including 100,000 Btu/h (29.3kW). 


7.80 


8. For the installation or relocation of each compressor over three horsepower (10.6 kW), to and including 15 horsepower 
(52.7 kW), or each absorption system over 100,000 Btu/h (29.3 kW) to and including 500,000 Btu/h (146.6 kW). 


14.30 


9. For the installation or relocation of each compressor over 15 horsepower (52.7 kW) to and including 30 horsepower (105.5 
kW), or each absorption system over 500,000 Btu/h (146.6 kW) to and including 1,000,000 Btu/h (293.1 kW). 


19.50 


10. For the installation or relocation of each compressor over 30 horsepower (105.5 kW) to and including 50 horsepower (176 
kW), or for each absorption system over 1,000,000 Btu/h (293.1 kW) to and including 1,750,000 Btu/h (512.9 kW). 


29.25 


1 1 . For the installation or relocation of each refrigeration compressor over 50 horsepower (176 kW), or each absorption system 
over 1,750,000 Btu/h (512.9 kW). 


48.75 


12. For each air-handling unit to and including 10,000 cubic feet per minute (4720 L/s), including ducts attached thereto. 

(Note: This fee shall not apply to an air-handling unit which is a portion of a factory-assembled apphance, cooling unit, 
evaporative cooler or absorption unit for which a permit is required elsewhere in this code.) 


5.85 


13. For each air-handling unit exceeding 10,000 cfm (4720 L/s). 


9.75 


14. For each evaporative cooler other than portable type. 


5.85 


15. For each ventilation fan connected to a single duct. 


3.90 


16. For each ventilation system which is not a portion of any heating or air-conditioning system authorized by a permit. 


5.85 


17. For the installation of each hood which is served by mechanical exhaust, including the ducts for such hood. 


5.85 


18. For the installation or relocation of each domestic-type incinerator. 


9.75 


19. For the installation or relocation of each commercial or industrial-type incinerator. 


39.00 


20. For each appliance or piece of equipment regulated by this code, but not classed in other appliance categories or for which 
no other fee is listed in this code. 


5.85 


21. Permit fees for fuel-gas piping shall be as follows: 
For each gas-piping system of one to four outlets. 
For each gas -pi ping system of five or more outlets, per outlet. 


2.60 
0.65 


OTHER INSPECTIONS AND FEES 


1. Inspections outside normal business hours (minimum charge 2 hours). 


$19.50/hour 


2. Reinspection fees assessed under provisions of Section 107.2.3. 


19.50 each 


3. Inspections for which no fee is specifically indicated (minimum charge V^ hour). 


19.50/hour 


4. Additional plan review required by changes, additions, or revisions to approved plans (minimum charge '/^ hour). 


19.50/hour 



2007 OREGOM WIECHAMICAL SPEC8ALTY CODE 



ADMINISTRATION 



> 



before backfill is put in place. When excavated soil con- 
tains rocks, broken concrete, frozen chunks and other 
rubble that would damage or break the piping or cause 
corrosive action, clean backfill shall be on the job site. 

2. Rough-in inspection shall be made after the roof, fram- 
ing, fireblocking and bracing are in place and all ducting 
and other components to be concealed are complete, and 
prior to the installation of wall or ceiling membranes. 

3. Final inspection shall be made upon completion of the 
mechanical system. 

Exceptions Ground-source heat pump loop systems tested 
in accordance with Section 1208. 1 . 1 shall be permitted to be 
backfilled prior to inspection. 

The requirements of this section shall not be considered to 
prohibit the operation of any heating equipment or appliances 
installed to replace existing heating equipment or appliances 
serving an occupied portion of a structure provided that a 
request for inspection of such heating equipment or appliances 
has been filed with the department not more than 48 hours after 
such replacement work is completed, and before any portion of 
such equipment or appliances is concealed by any permanent 
portion of the structure. 

107.2 Testing. Mechanical systems shall be tested as required 
in this code and in accordance with Sections 107.2.1 through 
107.2.3. Tests shall be made by the permit holder and observed 
by the code official. 

107o2ol New, altered, extended or repaired systems. New 

mechanical systems and parts of existing systems, which 
have been altered, extended, renovated or repaired, shall be 
tested as prescribed herein to disclose leaks and defects. 

107.2.2 Apparatus, material and labor for tests. Appara- 
tus, material and labor required for testing a mechanical sys- 
tem or part thereof shall be furnished by the permit holder. 

107.2.3 Reinspection and testing. Where any work or 
installation does not pass an initial test or inspection, the 
necessary corrections shall be made so as to achieve compli- 
ance with this code. The work or installation shall then be 
resubmitted to the code official for inspection and testing. 

107.3 Contractor responsibilities. It shall be the responsibil- 
ity of every contractor who enters into contracts for the installa- 
tion or repair of mechanical systems for which a permit is 
required to comply with adopted state and local rules and regu- 
lations concerning licensing and permits. 



After the prescribed tests and inspections 
indicate that the work complies in all respects with this code, a 
notice of approval shall be issued by the code official. 

107.S Temporary connection. The code official shall have the 
authority to authorize the temporary connection of a mechani- 
cal system to the sources of energy for the purpose of testing 
mechanical systems or for use under a temporary certificate of 
occupancy. 



SECTION 108 
VIOLATIONS 

108.1 Prohibited acts are described in ORS 455.450. 



ORS 455.450 is not part of this code but is reproduced here for the 
reader's convenience: 

455.450 Prohibited acts. A person shall not: 

(1) Violate or procure, aid or abet in the violation of any final 
order concerning the application of a provision of the state build- 
ing code in a particular case made by the Director of the Depart- 
ment of Consumer and Business Services, an advisory board, a 
state administrative officer or any local appeals board, building 
official or inspector. 

(2) Engage in or procure, aid or abet any other person to engage in 
any conduct or activity for which a permit, certificate, label or 
other formal authorization is required by any specialty code or 
other regulation promulgated pursuant to this chapter without 
first having obtained such permit, certificate, label or other for- 
mal authorization. 



108.2 Notice of violation. The code official shall serve a notice 
of violation or order to the person responsible for the erection, 
installation, alteration, extension or repair of mechanical work 
in violation of the provisions of this code, or in violation of a 
detail statement or the approved construction documents there- 
under, or in violation of a permit or certificate issued under the 
provisions of this code. Such order shall direct the discontinu- 
ance of the illegal action or condition and the abatement of the 
violation. 

108.3 Violation penalties. 

108.3.1 General. Persons who violate a provision of this 
code or fail to comply with any of the requirements thereof 
or who erects, installs, alters or repairs mechanical work in 
violation of the approved construction documents or direc- 
tive of the code official, or of a permit or certificate issued 
under the provisions of this code may be subject to penalties 
as prescribed by law. 

108.3.2 Penalties. Penalties for violations are prescribed in 
ORS 455.895 or as adopted by the municipality having 
authority. Local authority to levy penalties is limited to vio- 
lations of code application only unless authorized as an 
agent under ORS 455.156. 

108.4 Stop work orders. Upon notice from the code official 
that mechanical work is being done contrary to the provisions 
of this code or in a dangerous or unsafe manner, such work 
shall immediately cease. Such notice shall be in writing and 
shall be given to the owner of the property, or to the owner's 
agent, or to the person doing the work. The notice shall state the 
conditions under which work is authorized to resume. Where 
an emergency exists, the code official shall not be required to 
give a written notice prior to stopping the work. Any person 
who shall continue any work on the system after having been 
served with a stop work order, except such work as that person 
is directed to perform to remove a violation or unsafe condi- 
tion, may be liable for a fine. 



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2007 OREGON MECHANICAL SPECIALTY CODE 



ORS 455.895 and 455.156 are not part of this code but are repro- 
duced here for the reader's convenience: 

455.895 Civil penalties. 

(1) 

(a) The State Plumbing Board may impose a civil penalty against 
a person as provided under ORS 447.992 and 693.992. Amounts 
recovered under this paragraph are subject to ORS 693.165. 

(b) The Electrical and Elevator Board may impose a civil pen- 
alty against a person as provided under ORS 479.995. Amounts 
recovered under this paragraph are subject to ORS 479.850. 

(c) The Board of Boiler Rules may impose a civil penalty against 
a person as provided under ORS 480.670. Amounts recovered 
under this paragraph shall be deposited to the General Fund. 

(2) The Director of the Department of Consumer and Business Ser- 
vices, in consultation with the appropriate board, if any, may 
impose a civil penalty against any person who violates any provi- 
sion of ORS 446.003 to 446.200, 446.225 to 446.285, 446.395 to 
446.420, 446.566 to 446.646, 446.666 to 446.746, 479.510 to 
479.945, 479.950 and 480.510 to 480.670 and this chapter and 
ORS chapters 447, 460 and 693, or any rule adopted or order issued 
for the administration and enforcement of those provisions. Except 
as provided in subsections (3) and (8) of this section or ORS 
446.995, a civil penalty imposed under this section must be in an 
amount determined by the appropriate board or the director of not 
more than $5,000 for each offense or, in the case of a continuing 
offense, not more than $1,000 for each day of the offense. 

(3) Each violation of ORS 446.003 to 446.200 or 446.225 to 
446.285, or any rule or order issued thereunder, constitutes a sep- 
arate violation with respect to each manufactured structure or 
with respect to each failure or refusal to allow or perform an act 
required thereby, except that the maximum civil penalty may not 
exceed $ 1 million for any related series of violations occurring 
within one year from the date of the first violation. 

(4) The maximum penalty estabUshed by this section for a viola- 
tion may be imposed only upon a finding that the person has 
engaged in a pattern of violations. The Department of Consumer 
and Business Services, by rule, shall define what constitutes a 
pattern of violations. Except as provided in subsections (1) and 
(9) of this section, moneys received from any civil penalty under 
this section are appropriated continuously for and shall be used 
by the director for enforcement and administration of provisions 
and rules described in subsecfion (2) of this section. 

(5) Civil penalties under this secdon shall be imposed as provided 
in ORS 183.745. 

(6) A civil penalty imposed under this section may be remitted or 
reduced upon such ternis and conditions as the director or the appro- 
priate board considers proper and consistent with the public health 
and safety. In any judicial review of a civil penalty imposed under 
this section, the court may, in its discretion, reduce the penalty. 

(7) Any officer, director, shareholder or agent of a corporation, or 
member or agent of a partnership or association, who personally 
participates in or is an accessory to any violation by the partner- 
ship, association or corporation of a provision or rule described in 
subsection (2) of this section is subject to the penalties prescribed 
in this section. 

(8) hi addition to the civil penalty set forth in subsection (1) or (2) of 
this section, any person who violates a provision or rule described in 
subsection (2) of this section may be required by the director or the 
appropriate board to forfeit and pay to the General Fund of the State 
Treasury a civil penalty in an amount determined by the director or 
board that shall not exceed five times the amount by which such per- 
son profited in any transaction that violates a provision or rule 
described in subsection (2) of this section. 



455.156 Municipal investigation and enforcement of certain 
violations; notice of civil penalty; department to develop pro- 
grams; defense for violation of building inspection program. 

(1) Notwithstanding any other provision of this chapter, ORS 
chapter 693 or ORS 447.010 to 447.156, 447.992, 479.510 to 
479.945, 479.990 or 479.995, the Department of Consumer and 
Business Services shall carry out the provisions of this secfion. 

(2) 

(a) A municipality that establishes a building inspection pro- 
gram under ORS 455.148 or a plumbing inspection program 
under ORS 455.150 covering installations under the plumb- 
ing specialty code or Low-Rise Residential Dwelling Code 
may act on behalf of the State Plumbing Board to investigate 
violations of and enforce ORS 447.040, 693.030 and 693.040 
and to issue notices of proposed assessment of civil penalties 
for those violations. 

(b) A municipality that establishes a building inspection pro- 
gram under ORS 455. 148 or an electrical inspection program 
under ORS 455.150 covering installations under the electrical 
specialty code or Low-Rise Residential Dwelling Code may 
act on behalf of the Electrical and Elevator Board to investi- 
gate violations of and enforce ORS 479.550 (1) and 479.620 
and to issue notices of proposed assessment of civil penalties 
for those violations. 

(c) A municipality that establishes a building inspection pro- 
gram under ORS 455.148 or 455.150 may investigate viola- 
tions and enforce any provisions of the program administered 
by the municipality. 

(3) The department shall establish; 

(a) Procedures, forms and standards to carry out the provi- 
sions of this section, including but not limited to creating 
preprinted notices of proposed assessment of penalties that 
can be completed and served by municipal inspectors; 

(b) A program to provide that all of the moneys recovered by 
the department, less collection expenses, be paid to the 
municipality that initiated the charges when a person charged 
with a violation as provided in subsection (2) of this section, 
other than a violation of a licensing requirement, agrees to the 
entry of an assessment of civil penalty or does not request a 
hearing, and an order assessing a penalty is entered against the 
person; 

(c) A uniform citation process to be used in all jurisdictions of 
the state for violation of a Ucensing requirement. The process 
may include but need not be limited to all program areas 
administered by a municipality under ORS 455.148 or 
455.150 and may provide a uniform method for checking 
license status and issuing citations for violation of a licensing 
requirement, and a consistent basis for enforcement of licens- 
ing requirements and treatment of violations, including fine 
amounts; 

(d) A program to provide a division of the moneys recovered 
by the department with the municipality that initiated the 
charges, when a person charged with a violation as provided 
in subsection (2) of this section, other than a violation of a 
licensing requirement, requests a hearing and is assessed a 
penalty. One-half of the amounts recovered shall be paid to 
the municipality. The department shall keep an amount equal 
to its costs of processing the proceeding and collection 
expenses out of the remaining one-half and remit the balance, 
if any, to tiie municipality; and 

(e) A program to require municipalities to investigate viola- 
tions of the department's permit requirements for plumbing 
installations and services under the plumbing specialty code 



2007 OREGON MECHANICAL SPECIALTY CODE 



ADMINISTRATIOM 



and for plumbing and electrical installations and services 
under the Low-Rise Residential Dwelling Code, and to: 

(A) Initiate notices of proposed assessment of civil penal- 
ties as agents of the boards designated in subsection (2) of 
this section; and 

(B) Pay the agents of the boards out of net civil penalty 
recoveries as if the recoveries were under paragraphs (b) 
and (d) of this subsection. 

(4) The assessment of a civil penalty under this section by a 
municipality is subject to the amount limitations set forth in ORS 
455.895. 

(5) 

(a) It shall be a defense for any person charged with a penalty 
for violation of a building inspection program permit require- 
ment covering plumbing installations under the plumbing 
specialty code, electrical permit requirements under ORS 
479.550 or plumbing or electrical requirements under the 
Low-Rise Residential Dwelling Code that the person was pre- 
viously penalized for the same occurrence. 

(b) A building inspection program permit requirement is a 
requirement contained in a specialty code or municipal ordi- 
nance or rule requiring a permit before the particular installa- 
tions covered by the codes are commenced. 

(c) A penalty for the same occurrence includes a combination 
of two or more of the following that are based on the same 
plumbing or electrical installation: 

(A) 

(i) An investigative or other fee added to an electrical 
permit fee when a permit was obtained after the electri- 
cal installation was started; 

(ii) A civil penalty pursuant to ORS 479.995 for viola- 
tion of ORS 479.550 for failure to obtain an electrical 
permit; 

(iii) A civil penalty pursuant to ORS 455.895 for failure 
to obtain an electrical permit under the Low-Rise Resi- 
dential Dwelhng Code; or 

(iv) A municipal penalty, other than an investigative fee, 
for making an electrical installation under the electrical 
specialty code or the Low-Rise Residential Dwelling 
Code without a permit; or 

(B) 

(i) An investigative or other fee added to a plumbing per- 
mit fee when a permit was obtained after the plumbing 
installation was started; 

(ii) A civil penalty pursuant to ORS 447.992 for failure 
to obtain a plumbing permit as required under the 
plumbing specialty code; 

(iii) A civil penalty pursuant to ORS 455.895 for failure 
to obtain a plumbing permit under the Low-Rise Resi- 
dential Dwelling Code; or 

(iv) A municipal penalty, other than an investigative fee, 
for making a plumbing installation under the plumbing 
specialty code or the Low-Rise Residential Dwelling 
Code without a permit. 



SECTION 109 
MEANS OF APPEAL 

109.1 General. In order to hear and decide appeals of orders, 
decisions or determinations made by the building official rela- 
tive to the application and interpretation of this code, the local 
jurisdiction shall establish an appeals procedure. 

109.2 Limitations on authority. An application for appeal 
shall be based on a claim that the true intent of this code or the 
rules legally adopted thereunder have been incorrectly inter- 
preted, the provisions of this code do not fully apply or an 
equally good or better form of construction is proposed. An 
appeals board, when appointed, shall have no authority to 
waive requirements of this code. 

109.3 Appeal of decision of building official. ORS 455.475 
provides an alternative appeals process to that set forth by the 
local municipality. 



< 



ORS 455.475 is not part of this code but is reproduced here for the 
reader's convenience: 

455.475 Appeal of decision of building official. A person aggrieved 
by a decision made by a building official under authority established 
pursuant to ORS 455. 148, 455. 150 or 455.467 may appeal the deci- 
sion. The following apply to an appeal under this section: 

(1) An appeal under this section shall be made first to the appropri- 
ate specialty code chief inspector of the Department of Consumer 
and Business Services. The decision of the department chief 
inspector may be appealed to the appropriate advisory board. The 
decision of the advisory board may only be appealed to the Director 
of the Department of Consumer and Business Services if codes in 
addition to the applicable specialty code are at issue. 

(2) If the appropriate advisory board determines that a decision by 
the department chief inspector is a major code interpretation, then 
the inspector shall distribute the decision in writing to all applicable 
specialty code public and private inspection authorities in the state. 
The decision shall be distributed within 60 days after the board's 
determination, and there shall be no charge for the distribution of 
the decision. As used in this subsection, a "major code interpreta- 
tion" means a code interpretation decision that affects or may affect 
more than one job site or more than one inspection jurisdiction. 

(3) If an appeal is made under this section, an inspection authority 
shall extend the plan review deadline by the number of days it takes 
for a final decision to be issued for the appeal. 



Note: Forms for filing an appeal under ORS 455.475 are available 
online at: www.bcd.oregon.gov. 

ORS 455.690 allows appeal of alocal appeals board decision to 
the state Building Codes Structures Board. Appeals to the 
Building Codes Structures Board are limited to those that are 
technical and scientific in nature. 



ORS 455.690 is not part of this code but is reproduced here for the 
reader's convenience: 

455.690 Appeal to advisory boards. Any person aggrieved by the 
final decision of a municipal appeals board or a subordinate officer of 
the Department of Consumer and Business Services as to the applica- 
tion of any provision of a specialty code may, within 30 days after the 
date of the decision, appeal to the appropriate advisory board. The 
appellant shall submit a fee of $20, payable to the department, with the 
request for appeal. The final decision of the involved municipality or 
state officer shall be subject to review and final determination by the 
appropriate advisory board as to technical and scientific determina- 
tions related to the application of the specialty code involved. 



2007 OREGON MECHANICAL SPECIALTY CODE 



10 2007 OREGON MECHANICAL SPECIALTY CODE 



DEFINITIONS 



GENERAL 

2(D)lol Scope. Unless otherwise expressly stated, the following 
words and terms shall, for the purposes of this code, have the 
meanings indicated in this chapter. 



Words used in the present tense 
include the future; words in the masculine gender include the 
feminine and neuter; the singular number includes the plural 
and the plural, the singular. 

2(0)1 o3 Terms deSimed in other codes. Where terms are not 
defined in this code and are defined in the Building Code, Elec- 
trical Code, Fire Code, or the Plumbing Code, such terms shall 
have meanings ascribed to them as in those codes. 



Except as defined in this chapter or 
elsewhere in this code, the interpretation of words used in this 
code shall be in accordance with the meanings defined in the 
building code and Webster's Third New International Dictio- 
nary of the English Language, Unabridged, copyright 1986. 



ICTION 202 



ABRASIVE MATERIALS. Moderately abrasive particulate 
in high concentrations, and highly abrasive particulate in mod- 
erate and high concentrations, such as alumina, bauxite, iron 
silicate, sand and slag. 

ABSORPTION SYSTEM. A refrigerating system in which 
refrigerant is pressurized by pumping a chemical solution of 
refrigerant in absorbent, and then separated by the addition of 
heat in a generator, condensed (to reject heat), expanded, evap- 
orated (to provide refrigeration), and reabsorbed in an absorber 
to repeat the cycle; the system may be single or multiple effect, 
the latter using multiple stages or internally cascaded use of 
heat to improve efficiency. 

ACCESS (TO). That which enables a device, appliance or 
equipment to be reached by ready access or by a means that first 
requires the removal or movement of a panel, door or similar 
obstruction [see also "Ready access (to)"]. 



All air supplied to mechanical equipment and appliances 
for combustion, ventilation, cooling, etc. Standard air is air at 
standard temperature and pressure, namely, 70°F (21°C) and 
29.92 inches of mercury (101.3 kPa). 



The treatment of air so as to control 
simultaneously the temperature, humidity, cleanness and dis- 
tribution of the air to meet the requirements of a conditioned 
space. 



A system that consists of 
heat exchangers, blowers, filters, supply, exhaust and return 
ducts, and shall include any apparatus installed in connection 
therewith. 



AIR DISTRIBUTION SYSTEM. Any system of ducts, ple- 
nums and air-handling equipment that circulates air within a 
space or spaces and includes systems made up of one or more 
air-handling units. 

AIR, EXHAUST. Air being removed from any space, appli- 
ance or piece of equipment and conveyed directly to the atmo- 
sphere by means of openings or ducts. 

AIR-HANDLING UNIT. A blower or fan used for the pur- 
pose of distributing supply air to a room, space or area. 

AIR, MAKEUP. Air that is provided to replace air being 
exhausted. 

ALTERATION. A change in a mechanical system that 
involves an extension, addition or change to the arrangement, 
type or purpose of the original installation. 

APPLIANCE. A device or apparatus that is manufactured and 
designed to utilize energy and for which this code provides spe- 
cific requirements. 

APPLIANCE, EXISTING. Any apphance regulated by this 
code which was legally installed prior to the effective date of 
this code, or for which a permit to install has been issued. 

APPLIANCE TYPE. 

High-heat appliance. Any apphance in which the products 
of combustion at the point of entrance to the flue under nor- 
mal operating conditions have a temperature greater than 
2,000°F (1093°C). 

Low-heat appliance (residential appliance). Any apph- 
ance in which the products of combustion at the point of 
entrance to the flue under normal operating conditions have 
a temperature of 1,000°F (538°C) or less. 

Medium-heat appliance. Any appliance in which the prod- 
ucts of combustion at the point of entrance to the flue under 
normal operating conditions have a temperature of more 
than 1,000°F (538°C), but not greater than 2,000°F 
(1093°C). 

APPLIANCE, VENTED. An appliance designed and 
installed in such a manner that all of the products of combus- 
tion are conveyed directly from the appliance to the outdoor 
atmosphere through an approved chimney or vent system. 

APPROVED. Acceptable to the code official or other author- 
ity having jurisdiction. 

APPROVED AGENCY. An established and recognized 
agency that is approved by the code official and regularly 
engaged in conducting tests or furnishing inspection services. 

AUTOMATIC BOILER. Any class of boiler that is equipped 
with the controls and limit devices specified in Chapter 10. 

BATHROOM. A room containing a bathtub, shower, spa or 
similar bathing fixture. 



2007 OREGON MECHANICAL SPECIALTY CODE 



11 



DEFINITIONS 



BOILERo A closed heating appliance intended to supply hot 
water or steam for space heating, processing or power pur- 
poses. Low-pressure boilers operate at pressures less than or 
equal to 15 pounds per square inch (psi) (103 kPa) for steam 
and 160 psi (1 103 kPa) for water. High-pressure boilers operate 
at pressures exceeding those pressures. 

BOILER ROOM. A room primarily utilized for the installa- 
tion of a boiler. 

BRAZED JOINT. A gas-tight joint obtained by the joining of 
metal parts with metallic mixtures or alloys which melt at a 
temperature above 1 ,000°F (538°C), but lower than the melting 
temperature of the parts to be joined. 

BRAZING. A metal joining process wherein coalescence is 
produced by the use of a nonferrous filler metal having a melt- 
ing point above 1 ,000°F (538°C), but lower than that of the base 
metal being joined. The filler material is distributed between 
the closely fitted surfaces of the joint by capillary attraction. 

BTU. Abbreviation for British thermal unit, which is the quan- 
tity of heat required to raise the temperature of 1 pound (454 g) 
of water IT (0.56°C) (1 Btu = 1055 J). 

BUILDING. Any structure occupied or intended for support- 
ing or sheltering any occupancy. 

BUILDING CODE. The Oregon Structural Specialty Code. 

BUILDING OFFICIAL. The officer charged with the admin- 
istration and enforcement of this code, or a duly authorized rep- 
resentative. 

CHIMNEY. A primarily vertical structure containing one or 
more flues, for the purpose of carrying gaseous products of 
combustion and air from a fuel-burning appliance to the out- 
door atmosphere. 

Factory-built chimney, A listed and labeled chimney com- 
posed of factory-made components, assembled in the field 
in accordance with manufacturer's instructions and the con- 
ditions of the listing. 

Masonry chimney. A field-constructed chimney composed 
of sohd masonry units, bricks, stones or concrete. 

Metal chimney. A field-constructed chimney of metal. 

CHIMNEY CONNECTOR. A pipe that connects a 
fuel-burning appliance to a chimney. 

CLEARANCE. The minimum distance through air measured 
between the heat-producing surface of the mechanical appli- 
ance, device or equipment and the surface of the combustible 
material or assembly. 

CLOSED COMBUSTION SOLIDFUELBURNING 

APPLIANCE. A heat-producing appliance that employs a 
combustion chamber that has no openings other than the flue 
collar, fuel charging door and adjustable openings provided to 
control the amount of combustion air that enters the combus- 
tion chamber. 

CLOTHES DRYER. An appliance used to dry wet laundry by 
means of heat. Dryer classifications are as follows: 

Type 1. Factory-built package, multiple production. Pri- 
marily used in family living environment. Usually the 
smallest unit physically and in function output. 



Type 2. Factory-built package, multiple production. Used in 
business with direct intercourse of the function with the 
public. Not designed for use in individual family living 
environment. 

CODE. These regulations, subsequent amendments thereto, or 
any emergency rule or regulation that the administrative 
authority having jurisdiction has lawfully adopted. 

CODE OFFICIAL. See "Building Official." I I 

COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other 
assembly constructed of one or more component materials that 
are not defined as noncombustible. 

COMBUSTIBLE LIQUIDS. Any liquids having a flash point 
at or above 100°F (38°C), and that are divided into the follow- 
ing classifications: 

Class II. Liquids having flash points at or above 100°F 
(38°C) and below 140°F (60°C). 

Class HI A. Liquids having flash points at or above 140°F 
(60°C) and below 200°F (93°C). 

Class IIIB. Liquids having flash points at or above 200°F 

(93°C). 

COMBUSTIBLE MATERIAL. Any material not defined as 
noncombustible. 

COMBUSTION. In the context of this code, refers to the rapid 
oxidation of fuel accompanied by the production of heat or heat 
and light. 

COMBUSTION AIR. Air necessary for complete combus- 
tion of a fuel, including theoretical air and excess air. 

COMBUSTION CHAMBER. The portion of an appliance 
within which combustion occurs. 

COMBUSTION PRODUCTS. Constituents resulting from 
the combustion of a fuel with the oxygen of the air, including 
the inert gases, but excluding excess air. 

COMMERCIAL COOKING RECIRCULATING SYS- 
TEM. Self-contained system consisting of the exhaust hood, 
the cooking equipment, the filters, and the fire suppression sys- 
tem. The system is designed to capture cooking vapors and res- 
idues generated from commercial cooking equipment. The 
system removes contaminants from the exhaust air and 
recirculates the air to the space from which it was withdrawn. 

COMMERCIAL COOKING APPLIANCES. Appliances 
used in a commercial food service establishment for heating or 
cooking food and which produce grease vapors, steam, fumes, 
smoke or odors that are required to be removed through a local 
exhaust ventilation system. Such appliances include deep fat 
fryers; upright broilers; griddles; broilers; steam-jacketed ket- 
tles; hot-top ranges; under-fired broilers (charbroilers); ovens; 
barbecues; rotisseries; and similar appliances. For the purpose 
of this definition, a food service establishment shall include 
any building or a portion thereof used for the preparation and 
serving of food. 

COMMERCIAL KITCHEN HOODS. 

Backshelf hood. A backshelf hood is also referred to as a 
low-proximity hood, or as a sidewall hood where wall 
mounted. Its front lower lip is low over the appliance(s) and 



12 



2007 OREGON MECHANICAL SPECIALTY CODE 



DEFINITIONS 



is "set back" from the front of the appUance(s). It is always 
closed to the rear of the appliances by a panel where 
free-standing, or by a panel or wall where wall mounted, 
and its height above the cooking surface varies. (This style 
of hood can be constructed with partial end panels to 
increase its effectiveness in capturing the effluent generated 
by the cooking operation). 

Double island canopy hood. A double island canopy hood 
is placed over back-to-back appliances or appliance lines. It 
is open on all sides and overhangs both fronts and the sides 
of the appliance(s). It could have a wall panel between the 
backs of the appliances. (The fact that exhaust air is drawn 
from both sides of the double canopy to meet in the center 
causes each side of this hood to emulate a wall canopy hood, 
and thus it functions much the same with or without an 
actual wall panel between the backs of the appliances). 

Eyebrow hood. An eyebrow hood is mounted directly to 
the face of an appliance, such as an oven and dishwasher, 
above the opening(s) or door(s) from which effluent is emit- 
ted, extending past the sides and overhanging the front of 
the opening to capture the effluent. 

Pass-over hood. A pass-over hood is a free-standing form 
of a backshelf hood constructed low enough to pass food 
over the top. 

Single island canopy hood. A single island canopy hood is 
placed over a single appliance or appliance Une. It is open on 
all sides and overhangs the front, rear, and sides of the appli- 
ance(s). A single island canopy is more susceptible to cross 
drafts and requires a greater exhaust air flow than an equiva- 
lent sized wall-mounted canopy to capture and contain 
effluent generated by the cooking operation (s). 

Wall canopy hood. A wall canopy exhaust hood is mounted 
against a wall above a single appliance or line of appli- 
ance(s), or it could be free-standing with a back panel from 
the rear of the appliances to the hood. It overhangs the front 
and sides of the appliance(s) on all open sides. 

The wall acts as a back panel, forcing the makeup air to be 
drawn across the front of the cooking equipment, thus 
increasing the effectiveness of the hood to capture and con- 
tain effluent generated by the cooking operation(s). 

COMPENSATING HOODS. Compensating hoods are those 
having integral (built-in) makeup air supply. The makeup air 
supply for such hoods is generally supplied from: short-circuit 
flow from inside the hood, air curtain flow from the bottom of 
the front face, and front face discharge from the outside front 
wall of the hood. The compensating makeup airflow can also 
be supplied from the rear or side of the hood, or the rear, front, 
or sides of the cooking equipment. The makeup airflow can be 
one or a combination of methods. 

COMPRESSOR. A specific machine, with or without acces- 
sories, for compressing a gas. 

COMPRESSOR, POSITIVE DISPLACEMENT. A com- 
pressor in which increase in pressure is attained by changing 
the internal volume of the compression chamber. 

COMPRESSOR UNIT. A compressor with its prime mover 
and accessories. 



CONCEALED LOCATION. A location that cannot be 
accessed without damaging permanent parts of the building 
structure or finish surface. Spaces above, below or behind 
readily removable panels or doors shall not be considered as 
concealed. 

CONDENSATE. The liquid that condenses from a gas 
(including flue gas) caused by a reduction in temperature. 

CONDENSER. A heat exchanger designed to liquefy refrig- 
erant vapor by removal of heat. 

CONDENSING UNIT. A specific refrigerating machine 
combination for a given refrigerant, consisting of one or more 
power-driven compressors, condensers, liquid receivers (when 
required), and the regularly furnished accessories. 

CONDITIONED SPACE. An area, room or space being 
heated or cooled by any equipment or appliance. 

CONFINED SPACES. A space having a volume less than 50 
cubic feet per 1 ,000 British thermal units per hour (Btu/h) (4.8 
m^/kW) of the aggregate input rating of all appliances installed 
in that space. 

CONSTRUCTION DOCUMENTS. All of the written, 
graphic and pictorial documents prepared or assembled for 
describing the design, location and physical characteristics of 
the elements of the project necessary for obtaining a building 
permit. The construction drawings shall be drawn to an appro- 
priate scale. 

CONTROL. A manual or automatic device designed to regu- 
late the gas, air, water or electrical supply to, or operation of, a 
mechanical system. 

CONVERSION BURNER. A burner designed to supply gas- 
eous fuel to an appliance originally designed to utilize another 
fuel. 

COOKING APPLIANCE. See "Commercial cooking appH- 
ances." 

DAMPER. A manually or automatically controlled device to 
regulate draft or the rate of flow of air or combustion gases. 

Volume damper. A device that, when installed, will restrict, 
retard or direct the flow of air in a duct, or the products of 
combustion in a heat-producing appliance, its vent connec- 
tor, vent or chimney therefrom. 

DESIGN FLOOD ELEVATION. The elevation of the 
"design flood," including wave height, relative to the datum 
specified on the community's legally designated flood hazard 
area map. 

DESIGN WORKING PRESSURE. The maximum allow- 
able working pressure for which a specific part of a system is 
designed. 

DIRECT REFRIGERATION SYSTEM. A system in which 
the evaporator or condenser of the refrigerating system is in 
direct contact with the air or other substances to be cooled or 
heated. 

DIRECT- VENT APPLIANCES. Appliances that are con- 
structed and installed so that all air for combustion is derived 
from the outdoor atmosphere and all flue gases are discharged 
to the outdoor atmosphere. | 



2007 OREGON MECHANICAL SPECIALTY CODE 



13 



DEFINITIONS 



r. The pressure difference existing between the apph- 
ance or any component part and the atmosphere, that causes a 
continuous flow of air and products of combustion through the 
gas passages of the appliance to the atmosphere. 

IiradliLiiced draft. The pressure difference created by the 
action of a fan, blower or ejector, that is located between the 
appliance and the chimney or vent termination. 



L The pressure difference created by a vent or 
chimney because of its height, and the temperature differ- 
ence between the flue gases and the atmosphere. 

DRIP. The container placed at a low point in a system of piping 
to collect condensate and from which the condensate is remov- 
able. 

DRY CLEANING SYSTEMS, Dry cleaning plants or sys- 
tems are classified as follows: 



je I. Those systems using Class I flammable liquid sol- 
vents having a flash point below lOOT (38°C). 

Type 11, Those systems using Class II combustible liquid 
solvents having a flash point at or above 100°F (38°C) and 
below 140°F (60°C). 

Type III. Those systems using Class III combustible liquid 
solvents having a flash point at or above 140°F (60°C). 

Types IV aed ¥. Those systems using Class IV nonflamma- 
ble liquid solvents. 

BUCT. A tube or conduit utilized for conveying air. The air 
passages of self-contained systems are not to be construed as 
air ducts. 

DUCT FURNACE. A warm-air furnace normally installed in 
an air distribution duct to supply warm air for heating. This def- 
inition shall apply only to a warm-air heating appliance that, for 
air circulation, depends on a blower not furnished as part of the 
furnace. 

DUCT SYSTEM, A continuous passageway for the transmis- 
sion of air that, in addition to ducts, includes duct fittings, 
dampers, plenums, fans and accessory air-handling equipment 
and appliances. 

DWELLING. A building or portion thereof that contains not 
more than two dwelling units. 

DWELLING UNIT. A single unit providing complete, inde- 
pendent living facilities for one or more persons, including per- 
manent provisions for living, sleeping, eating, cooking and 
sanitation. 

ELECTRIC HEATING APPLIANCE. An appliance that 
produces heat energy to create a warm environment by the 
application of electric power to resistance elements, refrigerant 
compressors or dissimilar material junctions. 

ELECTRICAL CODE. The Oregon Electrical Specialty 
Code. 

ENERGY RECOVERY VENTILATION SYSTEM, Sys- 
tems that employ air-to-air heat exchangers to recover energy 
from or reject energy to exhaust air for the purpose of pre-heat- 
ing, pre-cooling, humidifying or dehumidifying outdoor venti- 
lation air prior to supplying such air to a space, either directly or 
as part of an HVAC system. 



AIR. Air that is conveyed to or from 
occupied areas through ducts which are not part of the heating 
or air-conditioning system, such as ventilation for human 
usage, domestic kitchen range exhaust, bathroom exhaust and 
domestic clothes dryer exhaust. 



r. All piping, ducts, vents, control devices and 
other components of systems other than appliances which are 
permanently installed and integrated to provide control of envi- 
ronmental conditions for buildings. This definition shall also 
include other systems specifically regulated in this code. 

EQUIPMENT, EXISTING. Any equipment regulated by this 
code which was legally installed prior to the effective date of 
this code, or for which a permit to install has been issued. 

EVAPORATIVE COOLER. A device used for reducing the 
sensible heat of air for cooling by the process of evaporation of 
water into an airstream. 

EVAPORATIVE COOLING SYSTEM. The equipment and 
appliances intended or installed for the purpose of environmen- 
tal coohng by an evaporative cooler from which the condi- 
tioned air is distributed through ducts or plenums to the 
conditioned area. 



L That part of the system in which liquid 
refrigerant is vaporized to produce refrigeration. 

EXCESS AIR, The amount of air provided in addition to theo- 
retical air to achieve complete combustion of a fuel, thereby 
preventing the formation of dangerous products of combus- 
tion. 

EXHAUST SYSTEM. An assembly of connected ducts, ple- 
nums, fittings, registers, grilles and hoods through which air is 
conducted from the space or spaces and exhausted to the out- 
door atmosphere. 



L An assembly consisting of a hearth and fire 
charriber of noncombustible material and provided with a 
chimney, for use with solid fuels. 

Factory-bmilt fireplace. A listed and labeled fireplace and 
chimney system composed of factory-made components, 
and assembled in the field in accordance with manufac- 
turer's instructions and the conditions of the listing. 



lace. A field-constructed fireplace com- 
posed of solid masonry units, bricks, stones or concrete. 



I. A free-standing chimney-connected 
solid-fuel-buming heater, designed to be operated with the fire 
chamber doors in either the open or closed position. 

FLAME SAFEGUARD. A device that will automatically shut 
off the fuel supply to a main burner or group of burners when 
the means of ignition of such burners becomes inoperative, and 
when flame failure occurs on the burner or group of burners. 



Extra-heavy-duty cooking appliances include appliances uti- 
lizing solid fuel such as wood, charcoal, briquettes, and mes- 
quite to provide all or part of the heat source for cooking. | 

FIRE CODE. As referenced in this code for construction, 
alteration and repair of buildings and structures is the Oregon 
Fire Code as adopted and amended by the State of Oregon Fire 
Marshal. 



14 



2007 OREGON WiECHANICAL SPECIALTY CODE 



DEFINITIONS 



FLAME SPREAD INDEX. The numerical value assigned to 
a material tested in accordance with ASTM E 84. 

FLAMMABILITY CLASSIFICATION. Refrigerants shall 
be assigned to one of the three classes — 1, 2 or 3 — in accor- 
dance with ASHRAE 34. For Classes 2 and 3, the heat of com- 
bustion shall be calculated assuming that combustion products 
are in the gas phase and in their most stable state. 

Class 1. Refrigerants that do not show flame propagation 
when tested in air at 14.7 psia (101 kPa) and 70°F (21°C). 

Class 2, Refrigerants having a lower flammability limit 
(LFL) of more than 0.00625 pound per cubic foot (0.10 
kg/m3) at 70°F (21°C) and 14.7 psia (101 kPa) and a heat of 
combustion of less than 8,174 Btu/lb (19 000 kJ/kg). 

Class 3. Refrigerants that are highly flammable, having a 
LFL of less than or equal to 0.00625 pound per cubic foot 
(0. 10 kg/m^) at 70T (2rC) and 14.7 psia (101 kPa) or a heat 
of combustion greater than or equal to 8,174 Btu/lb (19 000 
kJ/kg). 

FLAMMABLE LIQUIDS. Any liquid that has a flash point 
below 100°F (38°C), and has a vapor pressure not exceeding 40 
psia (276 kPa) at 100°F (38°C). Flammable liquids shall be 
known as Class I liquids and shall be divided into the following 
classifications: 

Class lA. Liquids having a flash point below 73°F (23°C) 
and a boiling point below lOOT (38°C). 

Class IB. Liquids having a flash point below 73°F (23°C) 
and a boiling point at or above 100°F (38°C). 

Class IC. Liquids having a flash point at or above 73°F 
(23°C) and below 100°F (38°C). 

FLAMMABLE VAPOR OR FUMES. Mixtures of gases in 
air at concentrations equal to or greater than the LFL and less 
than or equal to the upper flammability limit (UFL). 

FLASH POINT. The minimum temperature corrected to a 
pressure of 14.7 psia (101 kPa) at which the application of a test 
flame causes the vapors of a portion of the sample to ignite 
under the conditions specified by the test procedures and appa- 
ratus. The flash point of a liquid shall be determined in accor- 
dance with ASTM D 56, ASTM D 93 or ASTM D 3278. 

FLOOR AREA, NET. The actual occupied area, not includ- 
ing unoccupied accessory areas or thicknesses of walls. 

FLOOR FURNACE. A completely self-contained furnace 
suspended from the floor of the space being heated, taking air 
for combustion from outside such space and with means for 
observing flames and lighting the appliance from such space. 

FLUE. A passageway within a chimney or vent through which 
gaseous combustion products pass. 

FLUE CONNECTION (BREECHING). A passage for con- 
ducting the products of combustion from a fuel-fired appliance 
to the vent or chimney (see also "Chimney connector" and 
"Vent connector"). 

FLUE GASES. Products of combustion and excess air. 

FLUE LINER (LINING). A system or material used to form 
the inside surface of a flue in a chimney or vent, for the purpose 
of protecting the surrounding structure from the effects of com- 



bustion products and conveying combustion products without 
leakage to the atmosphere. 

FUEL GAS. A natural gas, manufactured gas, liquefied petro- 
leum gas or a mixture of these. 

FUEL OIL. Kerosene or any hydrocarbon oil having a flash 
point not less than 100°F (38°C). 

FUEL-OIL PIPING SYSTEM. A closed piping system that 
connects a combustible liquid from a source of supply to a 
fuel-oil-buming appliance. 

FURNACE. A completely self-contained heating unit that is 
designed to supply heated air to spaces remote from or adjacent 
to the appliance location. 

FURNACE ROOM. A room primarily utilized for the instal- 
lation of fuel-burning, space-heating and water-heating appli- 
ances other than boilers (see also "Boiler room"). 

FUSIBLE PLUG. A device arranged to relieve pressure by 
operation of a fusible member at a predetermined temperature. 

GROUND SOURCE HEAT PUMP LOOP SYSTEM. Pip- 
ing buried in horizontal or vertical excavations or placed in a 
body of water for the purpose of transporting heat transfer liq- 
uid to and from a heat pump. Included in this definition are 
closed loop systems in which the liquid is recirculated and open 
loop systems in which the liquid is drawn from a well or other 
source. 

HAZARDOUS LOCATION. Any location considered to be a 
fire hazard for flammable vapors, dust, combustible fibers or 
other highly combustible substances. The location is not neces- 
sarily categorized in the Building Code as a high-hazard use 
group classification. 

HEAT EXCHANGER. A device that transfers heat from one 
medium to another. 

HEAT PUMP. A refrigeration system that extracts heat from 
one substance and transfers it to another portion of the same 
substance or to a second substance at a higher temperature for a 
beneficial purpose. 

HEAT TRANSFER LIQUID. The operating or thermal stor- 
age liquid in a mechanical system, including water Or other liq- 
uid base, and additives at the concentration present under 
operating conditions used to move heat from one location to 
another. Refrigerants are not included as heat transfer liquids. 

HEAVY-DUTY COOKING APPLIANCE. Heavy-duty 
cooking appliances include electric under-fired broilers, elec- 
tric chain (conveyor) broilers, gas under-fired broilers, gas 
chain (conveyor) broilers, gas open-burner ranges (with or 
without oven), electric and gas wok ranges, and electric and gas 
over-fired (upright) broilers and salamanders. 

HIGH-PROBABILITY SYSTEMS. A refrigeration system 
in which the basic design or the location of components is such 
that a leakage of refrigerant from a failed connection, seal or 
component will enter an occupancy classified area, other than 
the machinery room. 

HIGH-SIDE PRESSURE. The parts of a refrigerafing system 
subject to condenser pressure. 



2007 OREGON MECHANICAL SPECIALTY CODE 



15 



DEFlWmOMS 



An air-intake device used to capture by entrapment, 
impingement, adhesion or similar means, grease and similar 
contaminants before they enter a duct system. 

Type I. A kitchen hood for collecting and removing grease 
vapors and smoke. 



[. A general kitchen hood for collecting and remov- 
ing steam, vapor, heat and odors. 



L A self-con- 
tained package or factory-matched packages of integrated sys- 
tems for generating gaseous hydrogen. Hydrogen generating 
appliances utilize electrolysis, reformation, chemical, or other 
processes to generate hydrogen. 



L A flame, spark or hot surface capable 
of igniting flammable vapors or fumes. Such sources include 
appliance burners, burner ignitors and electrical switching 

devices. 



DANGEROUS TO LIFE OR HEALTH 
(IDLH). The concentration of airborne contaminants that 
poses a threat of death, immediate or delayed permanent 
adverse health effects, or effects that could prevent escape from 
such an environment. This contaminant concentration level is 
established by the National Institute of Occupational Safety 
and Health (NIOSH) based on both toxicity and flammability. 
It is generally expressed in parts per million by volume (ppm 
v/v) or milligrams per cubic meter (mg/m^). 



ECT REFRIGERATION SYSTEM. A system in 
which a secondary coolant cooled or heated by the refrigerat- 
ing system is circulated to the air or other substance to be 
cooled or heated. Indirect systems are distinguished by the 
method of application shown below: 



system. A system in which a secondary fluid is 
either cooled or heated by the refrigerating system and then 
circulated within a closed circuit in indirect contact with the 
air or other substance to be cooled or heated. 



-mdirect opee-spray system. A system in which 
the secondary substance for an indirect open-spray system 
is heated or cooled by an intermediate coolant circulated 
from a second enclosure. 



=spray system. A system in which a secondary cool- 
ant is cooled or heated by the refrigerating system and then 
circulated in direct contact with the air or other substance to 
be cooled or heated. 

Vented dosed system. A system in which a secondary cool- 
ant is cooled or heated by the refrigerating system and then 
passed through a closed circuit in the air or other substance 
to be cooled or heated, except that the evaporator or con- 
denser is placed in an open or appropriately vented tank. 

JOINT, FLANGEB. A joint made by bolting together a pair of 
flanged ends. 

JOINT, FLARED. A metal-to-metal compression joint in 
which a conical spread is made on the end of a tube that is com- 
pressed by a flare nut against a mating flare. 

JOINT, MECHANICAL. A general form of gas-tight joints 
obtained by the joining of metal parts through a positive-hold- 



ing mechanical construction, such as flanged joint, screwed 
joint or flared joint. 

JOINT, PLASTIC ADHESIVE. A joint made in tliermoset 
plastic piping by the use of an adhesive substance which forms 
a continuous bond between the mating surfaces without dis- 
solving either one of them. 

JOINT, PLASTIC HEAT FUSION. A joint made in thermo- 
plastic piping by heating the parts sufficiently to permit fusion 
of the materials when the parts are pressed together. 

JOINT, PLASTIC SOLVENT CEMENT. A joint made in 
thermoplastic piping by the use of a solvent or solvent cement 
which forms a continuous bond between the mating surfaces. 

JOINT, SOLDERED. A gas-tight joint obtained by the join- 
ing of metal parts with metallic mixtures of alloys which melt at 
temperatures between 400°F (204°C) and 1,000°F (538°C). 

JOINT, WELDED. A gas-tight joint obtained by the joining 
of metal parts in molten state. 

LABELED. Devices, equipment, appliances or materials to 
which have been affixed a label, seal, symbol or other identify- 
ing mark of a nationally recognized testing laboratory, inspec- 
tion agency or other organization concerned with product 
evaluation that maintains periodic inspection of the production 
of the above-labeled items and by whose label the manufac- 
turer attests to compliance with applicable nationally recog- 
nized standards. 

LIGHT-DUTY COOKING APPLIANCE. Light-duty cook- 
ing appliances include gas and electric ovens (including stan- 
dard, bake, roasting, revolving, retherm, convection, 
combination convection/steamer, conveyor, deck or deck-style 
pizza, and pastry), electric and gas steam-jacketed kettles, elec- 
tric and gas compartment steamers (both pressure and atmo- 
spheric) and electric and gas cheesemelters. 

LIMIT CONTROL. A device responsive to changes in pres- 
sure, temperature or level for turning on, shutting off or throt- 
tling the gas supply to an appliance. 

LIMITED CHARGE SYSTEM. A system in which, with the 
compressor idle, the design pressure will not be exceeded when 
the refrigerant charge has completely evaporated. 

LISTED. Equipment, appliances or materials included in a list 
published by a nationally recognized testing laboratory, 
inspection agency or other organization concerned with prod- 
uct evaluation that maintains periodic inspection of production 
of listed equipment, appliances or materials, and whose listing 
states either that the equipment, appliances or material meets 
nationally recognized standards or has been tested and found 
suitable for use in a specified manner. Not all testing laborato- 
ries, inspection agencies and other organizations concerned 
with product evaluation use the same means for identifying 
listed equipment, appliances or materials. Some do not recog- 
nize equipment, appliances or materials as listed unless they 
are also labeled. The authority having jurisdiction shall utilize 
the system employed by the listing organization to identify a 
listed product. 

LIVING SPACE. Space within a dwelling unit utilized for liv- 
ing, sleeping, eating, cooking, bathing, washing and sanitation 
purposes. 



16 



2007 OREGON MECHANICAL SPECIALTY CODE 



DEFINITIONS 



LOWER EXPLOSIVE LIMIT (LEL). See "LFL." 

LOWER FLAMMABLE LIMIT (LFL). The minimum con- 
centration of refrigerant that is capable of propagating a flame 
through a homogeneous mixture of refrigerant and air. 

LOW-PRESSURE HOT- WATER-HEATING BOILER. A 

boiler furnishing hot water at pressures not exceeding 160 psi 
(1 103 kPa) and at temperatures not exceeding 250°F (121°C). 

LOW-PRESSURE STEAM-HEATING BOILER. A boiler 
furnishing steam at pressures not exceeding 15 psi (103 kPa). 

LOW-PROBABILITY SYSTEMS. A refrigeration system in 
which the basic design or the location of components is such 
that a leakage of refrigerant from a failed connection, seal or 
component will not enter an occupancy-classified area, other 
than the machinery room. 

LOW-SIDE PRESSURE. The parts of a refrigerating system 
subject to evaporator pressure. 

MACHINERY ROOM. A room meeting prescribed safety 
requirements and in which refrigeration systems or compo- 
nents thereof are located (see Sections 1105 and 1106). 

MECHANICAL DRAFT SYSTEM. A venting system 
designed to remove flue or vent gases by mechanical means, 
that consists of an induced-draft portion under nonpositive 
static pressure or a forced-draft portion under positive static 
pressure. 

Forced-draft venting system. A portion of a venting sys- 
tem using a fan or other mechanical means to cause the 
removal of flue or vent gases under positive static pressure. 

Induced-draft venting system. A portion of a venting sys- 
tem using a fan or other mechanical means to cause the 
removal of flue or vent gases under nonpositive static vent 
pressure. 

Povt^er venting system. A portion of a venting system using 
a fan or other mechanical means to cause the removal of flue 
or vent gases under positive static vent pressure. 

MECHANICAL EQUIPMENT/APPLIANCE ROOM. A 

room or space in which nonfuel-fired mechanical equipment 
and appliances are located. 

MECHANICAL EXHAUST SYSTEM. A system for 
removing air from a room or space by mechanical means. 

MECHANICAL JOINT. A connection between pipes, fit- 
tings, or pipes and fittings, which is neither screwed, caulked, 
threaded, soldered, solvent cemented, brazed nor welded. 
Also, a joint in which compression is applied along the center- 
line of the pieces being joined. Some joints are part of a cou- 
pling, fitting or adapter. 

MECHANICAL SYSTEM. A system specifically addressed 
and regulated in this code and composed of components, 
devices, appliances and equipment. 

MEDIUM-DUTY COOKING APPLIANCE. Medium-duty 
cooking appliances include electric discrete element ranges 
(with or without oven), electric and gas hot-top ranges, electric 
and gas griddles, electric and gas double-sided griddles, elec- 
tric and gas fryers (including open deep fat fryers, donut fryers, 
kettle fryers, and pressure fryers), electric and gas pasta cook- 



ers, electric and gas conveyor pizza ovens, electric and gas 
tilting skillets (braising pans) and electric and gas rotisseries. 

MODULAR BOILER. A steam or hot-water-heating assem- 
bly consisting of a group of individual boilers called modules 
intended to be installed as a unit with no intervening stop 
valves. Modules are under one jacket or are individually jack- 
eted. The individual modules shall be limited to a maximum 
input rating of 400,000 Btu/h (117 228 W) gas, 3 gallons per 
hour (gph) (11.4 L/h) oil, or 115 kW (electric). 

NATURAL DRAFT SYSTEM. A venting system designed to 
remove flue or vent gases under nonpositive static vent pres- 
sure entirely by natural draft. 

NATURAL VENTILATION. The movement of air into and 
out of a space through intentionally provided openings, such as 
windows and doors, or through nonpowered ventilators. 

NONABRASIVE/ABRASIVE MATERIALS. Nonabrasive 
particulate in high concentrations, moderately abrasive partic- 
ulate in low and moderate concentrations, and highly abrasive 
particulate in low concentrations, such as alfalfa, asphalt, plas- 
ter, gypsum and salt. 

NONCOMBUSTIBLE MATERIALS. Materials that, when 
tested in accordance with ASTM E 136, have at least three of 
four specimens tested meeting all of the following criteria: 

1. The recorded temperature of the surface and interior 
thermocouples shall not at any time during the test rise 
more than 54°F (30°C) above the furnace temperature at 
the beginning of the test. 

2. There shall not be flaming from the specimen after the 
first 30 seconds. 

3. If the weight loss of the specimen during testing exceeds 
50 percent, the recorded temperature of the surface and 
interior thermocouples shall not at any time during the 
test rise above the furnace air temperature at the begin- 
ning of the test, and there shall not be flaming of the spec- 
imen. 

OCCUPANCY. The purpose for which a building, or portion 
thereof, is utilized or occupied. 

OFFSET (VENT). A combination of approved bends that 
make two changes in direction bringing one section of the vent 
out of line but into a line parallel with the other section. 

OUTDOOR AIR. Air taken from the outdoors, and therefore 
not previously circulated through the system. 

OUTDOOR OPENING. A door, window, louver or skylight 
openable to the outdoor atmosphere. | 

OUTLET. A threaded connection or bolted flange in a piping 
system to which a gas-burning appliance is attached. 

PANEL HEATING. A method of radiant space heating in 
which heat is supplied by large heated areas of room surfaces. 
The heating element usually consists of warm water piping, 
warm air ducts, or electrical resistance elements embedded in 
or located behind ceiling, wall or floor surfaces. 

PELLET FUEL-BURNING APPLIANCE. A closed-com- 
bustion, vented appliance equipped with a fuel-feed mecha- 



2007 OREGON MECHANICAL SPECIALTY CODE 



17 



DEFINITIONS 



nism for burning processed pellets of solid fuel of a specified 
size and composition. 



i. To clear of air, water or other foreign substances. 



J. Where used in this code, "piping" refers to either 
pipe or tubing, or both. 

Pipe. A rigid conduit of iron, steel, copper, brass or plastic. 



Ibbimig. Semirigid conduit of copper, aluminum, plastic or 
steel. 

PLASTIC, THERMOPLASTIC. A plastic that is capable of 
being repeatedly softened by increase of temperature and hard- 
ened by decrease of temperature. 

PLASTIC, THERMOSETTING, A plastic that is capable of 
being changed into a substantially infusible or insoluble prod- 
uct when cured under application of heat or chemical means. 

PLENUM. An enclosed portion of the building structure, 
other than an occupiable space being conditioned, that is 
designed to allow air movement, and thereby serve as part of an 
air distribution system. 

PLUMBING CODE. The Oregon Plumbing Specialty Code. 

PORTABLE FUEL CELL APPLIANCE. A fuel cell gener- 
ator of electricity, which is not fixed in place. A portable fuel 
cell appliance utihzes a cord and plug connection to a grid-iso- 
lated load and has an integral fuel supply. 

See "Boiler." 



ISES. A lot, plot or parcel of land, including any struc- 
ture thereon. 



TEST. A test performed in the field to 
prove system tightness. 

PRESSURE-LIMITING DEVICE. A pressure-responsive 
mechanism designed to stop automatically the operation of the 
pressure-imposing element at a predetermined pressure. 

PRESSURE RELIEF DEVICE. A pressure-actuated valve 
or rupture member designed to relieve excessive pressure auto- 
matically. 

PRESSURE RELIEF VALVE. A pressure-actuated valve 
held closed by a spring or other means and designed to relieve 
pressure automatically in excess of the device's setting. 

PRESSURE VESSELS. Closed containers, tanks or vessels 
that are designed to contain liquids or gases, or both, under 
pressure. 

PRESSURE VESSELS— REFRIGERANT, Any refriger- 
ant-containing receptacle in a refrigerating system. This does 
not include evaporators where each separate section does not 
exceed 0.5 cubic foot (0.014 m^) of refrigerant-containing vol- 
ume, regardless of the maximum inside dimensions, evapora- 
tor coils, controls, headers, pumps and piping. 



ANCE). Any noncombustible assembly that is labeled or con- 
structed in accordance with Table 308.6 and is placed between 
combustible materials or assemblies and mechanical appli- 
ances, devices or equipment, for the purpose of reducing 
required airspace clearances. Protective assemblies attached 
directly to a combustible assembly shall not be considered as 
part of that combustible assembly. 



VALVE. A valve that opens completely 
by fast action, either manually or automatically controlled. A 
valve requiring one-quarter round turn or less is considered to 
be quick opening. 



L A heater designed to transfer heat pri- 
marily by direct radiation. 

READY ACCESS (TO), That which enables a device, appli- 
ance or equipment to be directly reached, without requiring the 
removal or movement of any panel, door or similar obstruction 

[see "Access (to)"]. 



A vessel permanently connected to a 
refrigeration system by inlet and outlet pipes for storage of liq- 
uid refrigerant. 



L Air removed from a conditioned 
space and intended for reuse as supply air. 

RECLAIMED REFRIGERANTS. Refrigerants reprocessed 
to the same specifications as for new refrigerants by means 
including distillation. Such refrigerants have been chemically 
analyzed to verify that the specifications have been met. 
Reclaiming usually implies the use of processes or procedures 
that are available only at a reprocessing or manufacturing facil- 
ity. 



^S. Refrigerants removed 
from a system in any condition without necessarily testing or 
processing them. 

RECYCLED REFRIGERANTS. Refrigerants from which 
contaminants have been reduced by oil separation, removal of 
noncondensable gases, and single or multiple passes through 
devices that reduce moisture, acidity and particulate matter, 
such as replaceable core filter driers. These procedures usually 
are performed at the field job site or in a local service shop. 



r. A substance utilized to produce refrigera- 
tion by its expansion or vaporization. 

REFRIGERANT SAFETY CLASSIFICATIONS. Group- 
ings that indicate the toxicity and flammability classes in 
accordance with Section 1103.1. The classification group is 
made up of a letter (A or B) that indicates the toxicity class, fol- 
lowed by a number (1, 2 or 3) that indicates the flammability 
class. Refrigerant blends are similarly classified, based on the 
compositions at their worst cases of fractionation, as separately 
determined for toxicity and flammability. In some cases, the 
worst case of fractionation is the original formulation. 



Class 1 indicates refrigerants that do not 
show flame propagation in air when tested by prescribed 
methods at specified conditions. Classes 2 and 3 signify 
refrigerants with "lower flammability" and "higher 
flammability," respectively; the distinction depends on both 
the LFL and heat of combustion. 

Toxicity. Classes A and B signify refrigerants with "lower 
toxicity" and "higher toxicity," respectively, based on pre- 
scribed measures of chronic (long-term, repeated expo- 
sures) toxicity. 



I. A room or space in 
which an evaporator or brine coil is located for the purpose of 



18 



2007 OREGON WJECHANICAL SPECIALTY CODE 



DEFINITIONS 



reducing or controlling the temperature within the room or 
space to below 68°F (20°C). 

REFRIGERATING SYSTEM. A combination of intercon- 
nected refrigerant-containing parts constituting one closed 
refrigerant circuit in which a refrigerant is circulated for the 
purpose of extracting heat. 

REFRIGERATION CAPACITY RATING. Expressed as 1 
horsepower (0.75 kW), 1 ton or 12,000 Btu/h (3.5 kW), shall all 
mean the same quantity. 

REFRIGERATION MACHINERY ROOM. See "Machin- 
ery room." 

REFRIGERATION SYSTEM, ABSORPTION. A heat- 
operated, closed-refrigeration cycle in which a secondary fluid 
(the absorbent) absorbs a primary fluid (the refrigerant) that 
has been vaporized in the evaporator. 

Direct system. A system in which the evaporator is in direct 
contact with the material or space refrigerated, or is located 
in air-circulating passages communicating with such 
spaces. 

Indirect system. A system in which a brine coil cooled by 
the refrigerant is circulated to the material or space refriger- 
ated, or is utilized to cool the air so circulated. Indirect sys- 
tems are distinguished by the type or method of application. 

REFRIGERATION SYSTEM CLASSIFICATION. 
Refrigeration systems are classified according to the degree of 
probability that leaked refrigerant from a failed connection, 
seal or component will enter an occupied area. The distinction 
is based on the basic design or location of the components. 

REFRIGERATION SYSTEM, MECHANICAL. A combi- 
nation of interconnected refrigeration-containing parts consti- 
tuting one closed refrigerant circuit in which a refrigerant is 
circulated for the purpose of extracting heat and in which a 
compressor is used for compressing the refrigerant vapor. 

REFRIGERATION SYSTEM, SELF-CONTAINED. A 
complete factory-assembled and tested system that is shipped 
in one or more sections and has no refrigerant-containing parts 
that are joined in the field by other than companion or block 

valves. 

REGISTERED DESIGN PROFESSIONAL. An individual 
who is registered or licensed to practice their respective design 
profession as defined by the statutory requirements of the pro- 
fessional registration laws of the state or jurisdiction in which 
the project is to be constructed. 

RETURN AIR. Air removed from an approved conditioned 
space or location and recirculated or exhausted. 

RETURN AIR SYSTEM. An assembly of connected ducts, 
plenums, fittings, registers and grilles through which air from 
the space or spaces to be heated or cooled is conducted back to 
the supply unit (see also "Supply air system"). 

ROOM HEATER VENTED. A free-standing heating unit 
burning solid or liquid fuel for direct heating of the space in and 
adjacent to that in which the unit is located. 

SAFETY VALVE. A valve that relieves pressure in a steam 
boiler by opening fully at the rated discharge pressure. The 
valve is of the spring-pop type. 



SELF-CONTAINED EQUIPMENT. Complete, fac- 
tory-assembled and tested, heating, air-conditioning or refrig- 
eration equipment installed as a single unit, and having all 
working parts, complete with motive power, in an enclosed unit 
of said machinery. 

SHAFT. An enclosed space extending through one or more 
stories of a building, connecting vertical openings in succes- 
sive floors, or floors and the roof. 

SHAFT ENCLOSURE. The walls or construcdon forming 
the boundaries of a shaft. 

SLEEPING UNIT. A room or space in which people sleep, 
which can also include permanent provisions for living, eating, 
and either sanitation or kitchen facilities but not both. Such 
rooms and spaces that are also part of a dwelling unit are not 
sleeping units. 

SMOKE DAMPER. A listed device that is designed to resist 
the passage of air and smoke. The device is arranged to operate 
automatically, controlled by a smoke detection system, and 
when required, is capable of being positioned manually from a 
remote command station. 

SMOKE-DEVELOPED INDEX. A numerical value 
assigned to a material tested in accordance with ASTM E 84. 

SOLID FUEL (COOKING APPLICATIONS). Applicable 
to commercial food service operations only, solid fuel is any 
bulk material such as hardwood, mesquite, charcoal or bri- 
quettes that is combusted to produce heat for cooking opera- 
tions. 

SOURCE CAPTURE SYSTEM. A mechanical exhaust sys- 
tem designed and constructed to capture air contaminants at 
their source and to exhaust such contaminants to the outdoor 
atmosphere. 

STATIONARY FUEL CELL POWER PLANT. A self-con- 
tained package or factory-matched packages which constitute 
an automatically operated assembly of integrated systems for 
generating useful electrical energy and recoverable thermal 
energy that is permanently connected and fixed in place. 

STEAM-HEATING BOILER. A boiler operated at pressures 
not exceeding 15 psi (103 kPa) for steam. 

STOP VALVE. A shutoff valve for controUing the flow of Hq- 
uid or gases. 

STORY. That portion of a building included between the upper 
surface of a floor and the upper surface of the floor next above, 
except that the topmost story shall be that portion of a building 
included between the upper surface of the topmost floor and the 
ceiling or roof above. 

STRENGTH, ULTIMATE. The highest stress level that the 
component will tolerate without rupture. 

SUPPLY AIR. That air delivered to each or any space supplied 
by the air distribution system or the total air delivered to all 
spaces supplied by the air distribution system, which is pro- 
vided for ventilating, heating, cooling, humidification, 
dehumidification and other similar purposes. 

SUPPLY AIR SYSTEM. An assembly of connected ducts, 
plenums, fittings, registers and grilles through which air. 



2007 OREGON MECHANICAL SPECIALTY CODE 



19 



DEFINITIONS 



>l 



heated or cooled, is conducted from the supply unit to the space 
or spaces to be heated or cooled (see also "Return air system"). 

THEORETICAL AIR. The exact amount of air required to 
supply oxygen for complete combustion of a given quantity of 
a specific fuel. 

THERMAL RESISTANCE (R\ A measure of the ability to 
retard the flow of heat. The i?- value is the reciprocal of thermal 
conductance. 

TLV-TWA(THRESHOLD LIMIT VALUE-TIME- 
WEIGHTEB AVERAGE). The time-weighted average con- 
centration of a refrigerant or other chemical in air for a normal 
8-hour workday and a 40-hour workweek, to which nearly all 
workers are repeatedly exposed, day after day, without adverse 
effects, as adopted by the American Conference of Govern- 
ment Industrial Hygienists (ACGIH). 

TOILET ROOM. A room containing a water closet and, fre- 
quently, a lavatory, but not a bathtub, shower, spa or similar 
bathing fixture. 

TOXICITY CLASSIFICATION. Refrigerants shall be clas- 
sified for toxicity to one of two classes in accordance with 
ASHRAE 34: 

Class A. Refrigerants for which toxicity has not been identi- 
fied at concentrations less than or equal to 400 parts per mil- 
lion (ppm), based on data used to determine Threshold 
Limit Value-Time-Weighted Average (TLV-TWA) or con- 
sistent indices. 

Class B. Refrigerants for which there is evidence of toxicity 
at concentrations below 400 ppm, based on data used to 
determine TLV-TWA or consistent indices. 

TRANSITION FITTINGS, PLASTIC TO STEEL. An 
adapter for joining plastic pipe to steel pipe. The purpose of this 
fitting is to provide a permanent, pressure-tight connection 
between two materials which cannot be joined directly one to 
another. 

UNCONFINED SPACE. A space having a volume not less 
than 50 cubic feet per 1 ,000 Btu/h (4.8 m^/kW) of the aggregate 
input rating of all appliances installed in that space. Rooms 
communicating directly with the space in which the appliances 
are installed, through openings not furnished with doors, are 
considered a part of the unconfined space. 

UNIT HEATER. A self-contained appliance of the fan type, 
designed for the delivery of warm air directly into the space in 
which the appliance is located. 

UNUSUALLY TIGHT CONSTRUCTION. Construction 
meeting the following requirements: 

1 . Walls exposed to the outdoor atmosphere having a con- 
tinuous air barrier with openings gasketed or sealed; 

2. Weatherstripping on openable windows and doors; and 

3. Caulking or sealants are applied to areas, such as joints 
around window and door frames, between sole plates 
and floors, between wall-ceiling joints, between wall 



panels, at penetrations for plumbing, electrical and gas 
lines and at other openings. 

A building of ordinary tightness is one which does not meet 
the definition of unusually tight construction. 

VENT. A pipe or other conduit composed of factory-made 
components, containing a passageway for conveying combus- 
tion products and air to the atmosphere, listed and labeled for 
use with a specific type or class of appliance. 

Pellet vent. A vent listed and labeled for use with listed pel- 
let-fuel-buming appliances. 



L vent. A vent listed and labeled for use with the fol- 
lowing: 

1. Oil-burning appliances that are listed for use with 
Type L vents. 

2. Gas-fired appliances that are listed for use with Type 
B vents. 

VENT CONNECTOR. The pipe that connects an approved 
fuel-fired appliance to a vent. 

VENT DAMPER DEVICE, AUTOMATIC. A device 
intended for installation in the venting system, in the outlet of 
an individual automatically operated fuel-burning appliance 
that is designed to open the venting system automatically when 
the appliance is in operation and to close off the venting system 
automatically when the appliance is in a standby or shutdown 
condition. 

VENTILATION. The natural or mechanical process of sup- 
plying conditioned or unconditioned air to, or removing such 
air from, any space. 

VENTILATION AIR. That portion of supply air that comes 
from the outside (outdoors), plus any recirculated air that has 
been treated to maintain the desired quality of air within a des- 
ignated space. 

VENTING SYSTEM. A continuous open passageway from 
the flue collar of an appliance to the outside atmosphere for the 
purpose of removing flue or vent gases. A venting system is 
usually composed of a vent or a chimney and vent connector, if 
used, assembled to form the open passageway. 

VESTIBULE. A passage, hall or chamber between the outer 
door and the interior of a building. 

WATER HEATER. Appliances which heat potable water and 
are equipped with approved safety devices and operate at or 
below all of the following: 

1. Volume of 120 gallons (454 L); 

2. Water temperature of 210°F (98.9°C); 

3. 150 pounds (1031 kPa) per square inch operating pres- 
sure; and 

4. With 200,000 Btu (58 620 W) input. 



20 



2007 OREGON MECHANICAL SPECIALTY CODE 



CHAPTER 3 

GENERAL REGULATIONS 



SECTION 301 
GENERAL 

301.1 Scope. This chapter shall goyem the approval and instal- 
lation of all equipment and appliances that comprise parts of 
the building mechanical systems regulated by this code in 
accordance with Section 101.2. 

Equipment shall not be installed, altered or used in violation 
of this code. The fuel input rate to equipment shall be increased 
in excess of the approved Btu/h (W) rating at the altitude where 
it is being used. 

301.2 Energy utilization. Heating, ventilating and air-condi- 
tioning systems of all structures shall be designed and installed 
for efficient utilization of energy in accordance with Chapter 
13 of the Oregon Structural Specialty Code. 

301.3 Fuel gas appliances and equipment. The approval and 
installation of fuel gas distribution piping and equipment, fuel 
gas-fired appliances and fuel gas-fired appliance venting sys- 

I tems shall be in accordance with Appendix C. 

301.4 Listed and labeled. Appliances regulated by this code 
I shall be listed and labeled for the application in which they are 
I installed and used, unless otherwise approved in accordance 

with Section 105. 

Exception: Listing and labeling of appliances used for 
refrigeration shall be in accordance with Section 1101.2. 

301.5 Labeling. Labeling shall be in accordance with the pro- 
cedures set forth in Sections 301.5.1 through 301.5.2.3. 

301.5.1 Testing. An approved agency shall test a represen- 
tative sample of the mechanical equipment and appliances 
being labeled to the relevant standard or standards. The 
approved agency shall mairitain a record of all of the tests 
performed. The record shall provide sufficient detail to ver- 
ify compliance with the test standard. 

301.5.2 Inspection and identification. The approved 
agency shall periodically perform an inspection, which 
shall be in-plant if necessary, of the mechanical equipment 
and appliances to be labeled. The inspection shall verify that 
the labeled mechanical equipment arid appliances are repre- 
sentative of the mechanical equipment and appliances 
tested. 

301.5.2.1 Independent. The agency to be approved shall 
be objective and competent. To confirm its objectivity, 
the agency shall disclose all possible conflicts of interest. 

301.5.2.2 Equipment. An approved agency shall have 
adequate equipment to perform all required tests. The 
equipment shall be periodically calibrated. 

301.5.2.3 Personnel. An approved agency shall employ 
experienced personnel educated in conducting, supervis- 
ing and evaluating tests. 



301.6 Label information. A permanent factory-applied 
name-plate(s) shall be affixed to appliances on which shall 
appear in legible lettering, the manufacturer's name or trade- 
mark, the model number, serial number and the seal or mark of 
the approved agency. A label shall also include the following: 

1. Electrical equipment and appliances: Electrical rating in 
volts, amperes and motor phase; identification of indi- 
vidual electrical components in volts, amperes or watts, 
motor phase; Btu/h (W) output; and required clearances. 

2. Absorption units: Hourly rating in Btu/h (W); minimum 
hourly rating for units having step or automatic modulat- 
ing controls; type of fuel; type of refrigerant; cooling 
capacity in Btu/h (W); and required clearances. 

3. Fuel-burning units: Hourly rating in Btu/h (W); type of 
fuel approved for use with the appliance; and required 
clearances. 

4. Electric comfort heating appliances: Name and 
trade-mark of the manufacturer; the model number or 
equivalent; the electric rating in volts, ampacity and 
phase; Btu/h (W) output rating; individual marking for 
each electrical component in amperes or watts, volts and 
phase; required clearances from combustibles; and a seal 
indicating approval of the appliance by an approved 
agency. 



Note: For reference only. Not adopted as part of this code. 

Wood stoves, as defined by the Oregon Department of Environ- 
mental Quality OAR Chapter 340, Division 34, are required by 
DEQ to bear a certification label. 



301.7 Electrical. Electrical wiring, controls and connections 
to equipment and appliances regulated by this code shall be in 
accordance with the Electrical Code. 

301.8 Plumbing connections. Potable water supply and build- 
ing drainage system connections to equipment and appliances 
regulated by this code shall be in accordance with the Plumbing 
Code. 

301.9 Fuel types. Fuel-fired apphances shall be designed for 
use with the type of fuel to which they will be connected and the 
altitude at which they are installed. Appliances that comprise 
parts of the building mechanical system shall not be converted 
for the usage of a different fuel, except where approved and 
converted in accordance with the manufacturer's instructions. 
The fuel input rate shall not be increased or decreased beyond 
the limit rating for the altitude at which the appliance is 
installed. 

301.10 Vibration isolation. Where vibration isolation of 
equipment and appliances is employed, an approved means of 
supplemental restraint shall be used to accomplish the support 
and restraint. 



2007 OREGON MECHANICAL SPECIALTY CODE 



21 



GENERAL REGULATIONS 



301.11 Repair. Defective material or parts shall be replaced or 
repaired in such a manner so as to preserve the original 
approval or listing. 

301.12 Wind resistance. Mechanical equipment, appliances 
and supports that are exposed to wind shall be designed and 
installed to resist the wind pressures determined in accordance 
with the Building Code. 



hazard. For structures located in flood hazard 
areas, as identified by the local jurisdiction, mechanical sys- 
tems, equipment and appliances shall be located at or above the 
design flood elevation. 

Exceptions Mechanical systems, equipment and appliances 
are permitted to be located below the design flood elevation 
provided that they are designed and installed to prevent 
water from entering or accumulating within the components 
and to resist hydrostatic and hydrodynamic loads and 
stresses, including the effects of buoyancy, during the 
occurrence of flooding to the design flood elevation in com- 
pliance with the flood-resistant construction requirements 
of the Building Code. 



3.1 High-velocity wave action. In flood hazard areas 
subject to high-velocity wave action, mechanical systems 
and equipment shall not be mounted on or penetrate walls 
intended to break away under flood loads. 

301.14 Modentproofing. Buildings or structures and the walls 
enclosing habitable or occupiable rooms and spaces in which 
persons live, sleep or work, or in which feed, food or foodstuffs 
are stored, prepared, processed, served or sold, shall be con- 
structed to protect against the entrance of rodents in accordance 
with the Building Code. 

301.15 Seismic resistance. When earthquake loads are appli- 
cable in accordance with the Building Code, mechanical sys- 
tem supports shall be designed and installed for the seismic 
forces in accordance with the Building Code. 



SECTION 302 
PROTECTION OF STRUCTURE 

.1 Structural safety. The building or structure shall not be 
weakened by the installation of mechanical systems. Where 
floors, walls, ceilings or any other portion of the building or 
structure are required to be altered or replaced in the process of 
installing or repairing any system, the building or structure 
shall be left in a safe structural condition in accordance with the 
Building Code. 

302.2 Penetrations of floor/ceiling assemblies and 
ISre-resistance-rated assemblies. Penetrations of floor/ceil- 
ing assemblies and assemblies required to have a fire-resis- 
tance rating shall be protected in accordance with the Building 
Code. 

302.3 Cutting, notching and boring in wood framing. The 
cutting, notching and boring of wood framing members shall 
comply with Sections 302.3.1 through 302.3.4. 

302.3.1 Joist notching. Notches on the ends of joists shall 
not exceed one-fourth the joist depth. Holes bored in joists 
shall not be within 2 inches (5 1 mm) of the top or bottom of 



the joist, and the diameter of any such hole shall not exceed 
one-third the depth of the joist. Notches in the top or bottom 
of joists shall not exceed one- sixth the depth and shall not be 
located in the middle third of the span. 

302.3.2 Stud cutting and notching. In exterior walls and 
bearing partitions, any wood stud is permitted to be cut or 
notched not to exceed 25 percent of its depth. Cutting or 
notching of studs not greater than 40 percent of their depth is 
permitted in nonbearing partitions supporting no loads 
other than the weight of the partition. 

302.3.3 Bored holes. A hole not greater in diameter than 40 
percent of the stud depth is permitted to be bored in any 
wood stud. Bored holes not greater than 60 percent of the 
depth of the stud are permitted in nonbearing partitions or in 
any wall where each bored stud is doubled, provided not 
more than two such successive doubled studs are so bored. 
In no case shall the edge of the bored hole be nearer than 
0.625 inch (15.9 mm) to the edge of the stud. Bored holes 
shall not be located at the same section of stud as a cut or 
notch. 

302.3.4 Engineered wood products. Cuts, notches and 
holes bored in trusses, structural composite veneer lumber, 
structural glue-laminated members and I-joists are prohib- 
ited except where permitted by the manufacturer's recom- 
mendations or where the effects of such alterations are 
specifically considered in the design of the member. 

302.4 Alterations to trusses. Truss members and components 
shall not be cut, drilled, notched, spliced or otherwise altered in 
any way without written concurrence and approval of a regis- 
tered design professional. Alterations resulting in the addition of 
loads to any member (e.g., HVAC equipment, water heaters) 
shall not be permitted without verification that the truss is capa- 
ble of supporting such additional loading. 

302.5 Cutting, notching and boring in steel framing. The 
cutting, notching and boring of steel framing members shall 
comply with Sections 302.5.1 through 302.5.3. 

302.5.1 Cutting, notching and boring holes in structural 
steel framing. The cutting, notching and boring of holes in 
structural steel framing members shall be as prescribed by 
the registered design professional. 

302.5.2 Cutting, notching and boring holes in 
cold-formed steel framing. Flanges and lips of load-bear- 
ing cold-formed steel framing members shall not be cut or 
notched. Holes in webs of load-bearing cold-formed steel 
framing members shall be permitted along the centerline of 
the web of the framing member and shall not exceed the 
dimensional limitations, penetration spacing or minimum 
hole edge distance as prescribed by the registered design 
professional. Cutting, notching and boring holes of steel 
floor/roof decking shall be as prescribed by the registered 
design professional. 

302.5.3 Cutting, notching and boring holes in 
nonstructural cold-formed steel wall framing. Flanges 
and lips of nonstructural cold- formed steel wall studs shall 
not be cut or notched. Holes in webs of nonstructural 
cold-formed steel wall studs shall be permitted along the 
center-line of the web of the framing member, shall not 



22 



2007 OREGON MECHANICAL SPECIALTY CODE 



GENERAL REGULATIONS 




exceed 1 .5 inches (38 mm) in width or 4 inches (102 mm) in 
length, and shall not be spaced less than 24 inches (610 mm) 
center to center from another hole or less than 10 inches 
(254 mm) from the bearing end. 



SECTION303 
EQUIPMENT AND APPLIANCE LOCATION 

303.1 General. Equipment and appliances shall be located as 
required by this section, specific requirements elsewhere in this 
code and the conditions of the equipment and appliance listing. 

303.2 Hazardous locations. Appliances shall not be located in 
a hazardous location unless listed and approved for the specific 
installation. 

303.3 Prohibited locations. Fuel-fired appliances shall not be 
located in, or obtain combustion air from, any of the following 
rooms or spaces: 

1. Sleeping rooms. 

2. Bathrooms. 

3. Toilet rooms. 

4. Storage closets. 

5. Surgical rooms. 

Exception: This section shall not apply to the following 
appliances: 

1 . Direct-vent appliances that obtain all combustion air 
directly from the outdoors. 

2. Solid fuel-fired appliances, provided that the room is 
not a confined space and the building is not of unusu- 
ally tight construction. 

3. Appliances installed in a dedicated enclosure in 
which all combustion air is taken directly from the 
outdoors, in accordance with Section 703. Access to 
such enclosure shall be through a solid, 

> weather-stripped door equipped with an approved 

self-closing device. 

303.4 Protection from damage. Appliances shall not be 
installed in a location where subject to mechanical damage 
unless protected by approved barriers. 



• 



.5 Indoor locations. Fuel-fired furnaces and boilers 
installed in closets and alcoves shall be listed for such installa- 
tion. For purposes of this section, a closet or alcove shall be 
defined as a room or space having a volume less than 12 times 
the total volume of fuel-fired appliances other than boilers and 
less than 16 times the total volume of boilers. Room volume 
shall be computed using the gross floor area and the actual ceil- 
ing height up to a maximum computation height of 8 feet (2438 
mm). 

303.6 Outdoor locations. Appliances installed in other than 
indoor locations shall be listed and labeled for outdoor installa- 
tion. 

303.7 Pit locations. Appliances installed in pits or excavations 
shall not come in direct contact with the surrounding soil. The 
sides of the pit or excavation shall be held back a minimum of 
12 inches (305 mm) from the appliance. Where the depth 



exceeds 12 inches (305 mm) below adjoining grade, the walls 
of the pit or excavation shall be lined with concrete or masonry. 
Such concrete or masonry shall extend a minimum of 4 inches 
(102 mm) above adjoining grade and shall have sufficient lat- 
eral load-bearing capacity to resist collapse. The appliance 
shall be protected from flooding in an approved manner. 

303.8 Elevator shafts. Mechanical systems shall not be 
located in an elevator shaft. 



SECTION 304 
INSTALLATION 

304.1 General. Equipment and appliances shall be installed as 
required by the terms of their approval, in accordance with the 
conditions of the listing, the manufacturer's installation 
instructions and this code. Manufacturer's installation instruc- 
tions shall be available on the job site at the time of inspection. 

304.2 Conflicts. Where conflicts between this code and the 
conditions of listing or the manufacturer's installation instruc- 
tions occur, the provisions of this code shall apply. 

Exception: Where a code provision is less restrictive than 
the conditions of the listing of the equipment or appliance or 
the manufacturer's installation instructions, the conditions 
of the listing and the manufacturer's installation instructions 
shall apply. 

304.3 Elevation of ignition source. Heating and/or cooling 
equipment and water heaters covered by this code, located in a 
garage and which generate a glow, spark or flame capable of 
igniting flammable vapors, shall be installed with sources of 
ignition at least 18 inches (457 mm) above the floor level. 

304.3.1 Parking garages. Connection of a parking garage 
with any room in which there is a fuel-fired appliance shall 
be by means of a vestibule providing a two-doorway separa- 
tion, except that a single door is permitted where the sources 
of ignition in the appliance are elevated in accordance with 
Section 304.3. 

Exception: This section shall not apply to appliance 
installations complying with Section 304.5. 

[EG] 304.4 Hydrogen-generating and refueling operations. 

Ventilation shall be required in accordance with Section 
304.4.1, 304.4.2 or 304.4.3 in public garages, private garages, 
repair garages, automotive service stations and parking 
garages that contain hydrogen-generating appliances or refuel- 
ing systems. For the purpose of this section, rooms or spaces 
that are not part of the living space of a dwelling unit and that 
communicate directly with a private garage through openings 
shall be considered to be part of the private garage. 

[EG] 304.4.1 Natural ventilation. Indoor locations 
intended for hydrogen-generating or refueling operations 
shall be limited to a maximum floor area of 850 square feet 
(79 m^) and shall communicate with the outdoors in accor- 
dance with Sections 304.4. 1 . 1 through 304.4. 1 .2. The maxi- 
mum rated output capacity of hydrogen generating 
appliances shall not exceed 4 standard cubic feet per minute 
(0.00189 mVs) of hydrogen for each 250 square feet (23.2 
m^) of floor area in such spaces. The minimum cross-sec- 
tional dimension of air openings shall be 3 inches (76 mm). 



2007 OREGON MECHANICAL SPECIALTY CODE 



23 



GENERAL REGULATIONS 



Where ducts are used, they shall be of the same cross-sec- 
tional area as the free area of the openings to which they 
connect. In such locations, equipment and appliances hav- 
ing an ignition source shall be located such that the source of 
ignition is not within 12 inches (305 mm) of the ceiling. 



1.4.1.1 Two openings. Two permanent openings 
shall be provided within the garage. The upper opening 
shall be located entirely within 12 inches (305 mm) of the 
ceiling of the garage. The lower opening shall be located 
entirely within 12 inches (305 mm) of the floor of the 
garage. Both openings shall be provided in the same 
exterior wall. The openings shall communicate directly 
with the outdoors and shall have a minimum free area of 
V2 square foot per 1,000 cubic feet (1 m7610 m^) of 
garage volume. 

[FG] 304.4.1.2 Louvers and grilles. In calculating free 
area required by Section 304.4.1, the required size of 
openings shall be based on the net free area of each 
opening. If the free area through a design of louver or 
grille is known, it shall be used in calculating the size 
opening required to provide the free area specified. If 
the design and free area are not known, it shall be 
assumed that wood louvers will have 25 percent free 
area and metal louvers and grilles will have 75 percent 
free area. Louvers and grilles shall be fixed in the open 
position. 

[FG] 304.4.2 Mechanical ventilation. Indoor locations 
intended for hydrogen-generating or refueling operations 
shall be ventilated in accordance with Section 502.16. In 
such locations, equipment and apphances having an igni- 
tion source shall be located such that the source of ignition is 
below the mechanical ventilation outlet(s). 

[FG] 304.4.3 Specially engineered installations. As an 
alternative to the provisions of Sections 304.4. 1 and 304.4.2 
the necessary supply of air for ventilation and dilution of 
flammable gases shall be provided by an approved engi- 
neered system. 

304.5 Public garages. Appliances located in public garages, 
motor fueling dispensing facilities, repair garages or other 
areas frequented by motor vehicles, shall be installed a mini- 
mum of 8 feet (2438 mm) above the floor. Where motor vehi- 
cles exceed 6 feet (1829 mm) in height and are capable of 
passing under an apphance, appliances shall be installed a min- 
imum of 2 feet (610 mm) higher above the floor than the height 
of the tallest vehicle. 



304.6 Private garages. Appliances located in private garages 
and car]3orts shall be installed with a minimum clearance of 6 
feet (1829 mm) above the floor. 

Exception: The requirements of this section shall not apply 
where the appliances are protected from motor vehicle 
impact and installed in accordance with Section 304.3 and 
Figure 304.1. 

304.7 Construction and protection. Boiler rooms and fur- 
nace rooms shall be protected as required by the Building 
Code. 

304.8 Clearances to combustible construction. Heat-pro- 
ducing equipment and appliances shall be installed to maintain 
the required clearances to combustible construction as speci- 
fied in the listing and manufacturer's instructions. Such clear- 
ances shall be reduced only in accordance with Section 308. 
Clearances to combustibles shall include such considerations 
as door swing, drawer pull, overhead projections or shelving 
and window swing, shutters, coverings and drapes. Devices 
such as doorstops or limits, closers, drapery ties or guards shall 
not be used to provide the required clearances. 

304.9 Clearances from grade. Equipment and appliances 
installed at grade level shall be supported on a level concrete 
slab or other approved material extending above adjoining 
grade or shall be suspended a minimum of 6 inches (152 mm) 
above adjoining grade. 

304.10 Guards. Guards shall be provided where appliances, 
equipment, fans or other components that require service are 
located within 10 feet (3048 mm) of a roof edge or open side of 
a walking surface and such edge or open side is located more 
than 30 inches (762 mm) above the floor, roof or grade below. 
The guard shall extend not less than 30 inches (762 mm) 
beyond each end of such appliances, equipment, fans, compo- 
nents and the top of the guard shall be located not less than 42 
inches (1067 mm) above the elevated surface adjacent to the 
guard. The guard shall be constructed so as to prevent the pas- 
sage of a 21 -inch-diameter (533 mm) sphere and shall comply 
with the loading requirements for guards specified in the Build- 
ing Code. 

Exception: The section shall not apply to the replacement, 
repair or maintenance of an existing appliance or piece of 
equipment lawfully in existence at the time of the adoption 
of this code. 



Exception: The requirements of this section shall not apply 
where the appliances are protected from motor vehicle 
impact and installed in accordance with Section 304.3 and 
Figure 304.1. 



304.11 Area served. Appliances serving different areas of a 
building other than where they are installed shall be perma- 
nently marked in an approved manner that uniquely identifies 
the appliance and the area it serves. 



24 



2007 OREGON MECHANICAL SPECIALTY CODE 



.^ 



c 

CO 



(0 
O 



< 

m 

X 

o 

r- 
m 

>o 

■^ 30 

> m 

SE 

m 
o 
O 



Examples of barrier locations, when appliances are 
in the path of vehicles 



^Minimum 2" sch. 40 iron pipe- 
filled witli concrete 



Furnace 




Option 2: 
Wheel Barrier. -. 






Veliicle 
1 



For appliances not In tlie path of the 
vehicles, this bollard is optional 




Vehicle 
2 




Wheel Barrier 
(Option 2) 



Bolt to slab 



(Option 3) 
For retro installations 



2" Dia. min. 
Steel Sch. 40 pipe or tube 




> 


2" 


>Y' 


< 






9 




6" 


e 


^ 






*-1 


-^ 




-« 


8" " 





36" 




J pohcretejslab 



^11 I u. 



GENERAL REGULATIONS 



SECTION 305 
PIPING SUPPORT 

305.1 General. All mechanical system piping shall be sup- 
ported in accordance with this section. 

305.2 Materials. Pipe hangers and supports shall have suffi- 
cient strength to withstand all anticipated static and specified 
dynamic loading conditions associated with the intended use. 
Pipe hangers and supports that are in direct contact with piping 
shall be of approved materials that are compatible with the pip- 
ing and that will not promote galvanic action. 

305.3 Structural attachment. Hangers and anchors shall be 
attached to the building construction in an approved manner. 

305.4 Interval of support. Piping shall be supported at dis- 
tances not exceeding the spacing specified in Table 305.4, or in 
accordance with MSS SP-69. 

TABLE 305.4 
PIPING SUPPORT SPACING^ 



PIPING MATERIAL 


MAXIMUM 

HORIZONTAL 

SPACING 

(feet) 


MAXIMUM 

VERTICAL 

SPACING 

(feet) 


ABS pipe 


4 


10^ 


Aluminum pipe and tubing 


10 


15 


Brass pipe 


10 


10 


Brass tubing, 1 V4-inch diameter 
and smaller 


6 


10 


Brass tubing, 1 Vj-inch diameter 
and larger 


10 


10 


Cast-iron pipe'' 


5 


15 


Copper or copper-alloy pipe 


12 


10 


Copper or copper-alloy tubing, 
1 V4-inch diameter and smaller 


6 


10 


Copper or copper-alloy tubing, 
1 V2-inch diameter and larger 


10 


10 


CPVC pipe or tubing, 1 inch 
and smaller 


3 


10^= 


CPVC pipe or tubing 1 '/4-inch 
and larger 


4 


10= 


Lead pipe 


Continuous 


4 


PB pipe or tubing 


2% 
(32 inches) 


4 


PEX tubing 


2% 
(32 inches) 


10= 


PVC pipe 


4 


10= 


Steel tubing 


8 


10 


Steel pipe 


12 


15 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 

a. See Section 301.15. 

b. The maximum horizontal spacing of cast-iron pipe hangers shall be 
increased to 10 feet where| 10-foot lengths of pipe are installed. 

c. Mid-story guide. 



305.5 Protection against physical damage. In concealed 
locations where piping, other than cast-iron or steel, is installed 
through holes or notches in studs, joists, rafters or similar mem- 
bers less than 1.5 inches (38 mm) from the nearest edge of the 
member, the pipe shall be protected by shield plates. Protective 
shield plates shall be a minimum of 0.062-inch-thick (1.6 mm) 
steel, shall cover the area of the pipe where the member is 
notched or bored, and shall extend a minimum of 2 inches (5 1 
mm) above sole plates and below top plates. 



SECTION 306 
ACCESS AND SERVICE SPACE 

306.1 Clearances for maintenance and replacement. Clear- 
ances around appliances to elements of permanent construc- 
tion, including other installed equipment and appliances, shall 
be sufficient to allow inspection, service, repair or replacement 
without removing such elements of permanent construction or 
disabling the function of a required fire-resistance-rated 
assembly. 

306.1.1 Central furnaces. Central furnaces within com- 
partments or alcoves shall have a minimum working space 
clearance of 3 inches (76 mm) along the sides, back and top 
with a total width of the enclosing space being at least 12 
inches (305 mm) wider than the furnace. Furnaces having a 
firebox open to the atmosphere shall have at least 6 inches 
(152 mm) working space along the front combustion cham- 
ber side. Combustion air openings at the rear or side of the 
compartment shall comply with the requirements of Chap- 
ter?. 

Exception: This section shall not apply to replacement 
appliances installed in existing compartments and 
alcoves where the working space clearances are in accor- 
dance with the equipment or appliance manufacturer's 
installation instructions. 

306.2 Appliances in rooms. Rooms containing appliances 
requiring access shall be provided with a door and an unob- 
structed passageway measuring not less than 36 inches (914 
mm) wide and 80 inches (2032 mm) high. 

Exception: Within a dwelling unit, appliances installed in a 
compartment, alcove, basement or similar space shall be 
accessed by an opening or door and an unobstructed pas- 
sageway measuring not less than 24 inches (610 mm) wide 
and large enough to allow removal of the largest appliance 
in the space, provided that a level service space of not less 
than 30 inches (762 mm) deep and the height of the appli- 
ance, but not less than 30 inches (762 mm), is present at the 
front or service side of the appliance with the door open. 

306.3 Appliances in attics. Attics containing appliances 
requiring access shall be provided with an opening and unob- 
structed passageway large enough to allow removal of the larg- 
est appliance. The passageway shall not be less than 30 inches 
(762 mm) high and 22 inches (559 mm) wide and not more than 
20 feet (6096 mm) in length measured along the center line of 
the passageway from the opening to the appliance. The pas- 
sageway shall have continuous solid flooring not less than 24 
inches (610 mm) wide. A level service space not less than 30 
inches (762 mm) deep and 30 inches (762 mm) wide shall be 



26 



2007 OREGON MECHANICAL SPECIALTY CODE 



GENERAL REGULATIONS 



present at the front or service side of the apphance. The clear 
access opening dimensions shall be a minimum of 20 inches by 
30 inches (508 mm by 762 mm), where such dimensions are 
large enough to allow removal of the largest appliance. 

Exceptions: 

1. The passageway and level service space are not 
required where the appliance is capable of being ser- 
viced and removed through the required opening. 

2. Where the passageway is unobstructed and not less 
than 6 feet (1 829 mm) high and 22 inches wide for its 
entire length, the passageway shall be not greater than 
50 feet (15 250 mm) in length. 

306.3.1 Electrical requirements. A luminaire controlled 
by a switch located at the required passageway opening and 
a receptacle outlet shall be provided at or near the appliance 
location in accordance with the Electrical Code. 

306.4 Appliances under floors. Underfloor spaces containing 
appliances requiring access shall be provided with an access 
opening and unobstructed passageway large enough to remove 
the largest appliance. The passageway shall not be less than 30 
inches (762 mm) high and 22 inches (559 mm) wide, nor more 
than 20 feet (6096 mm) in length nieasured along the centerline 
of the passageway from the opening to the appliance. A level 
service space not less than 30 inches (762 mm) deep and 30 
inches (762 mm) wide shall be present at the front or service 
side of the appliance. If the depth of the passageway or the ser- 
vice space exceeds 12 inches (305 mm) below the adjoining 
grade, the walls of the passageway shall be lined with concrete 
or masonry. Such concrete or masonry shall extend a minimum 
of 4 inches (102 mm) above the adjoining grade and shall have 
sufficient lateral-bearing capacity to resist collapse. The clear 
access opening dimensions shall be a minimum of 22 inches by 
30 inches (559 mm by 762 mm), where such dimensions are 
large enough to allow removal of the largest appliance. 

Exceptions: 

1. The passageway is not required where the level ser- 
vice space is present when the access is open and the 
appliance is capable of being serviced and removed 
through the required opening. 

2. Where the passageway is unobstructed and not less 
than 6 feet high (1929 mm) and 22 inches wide for its 
entire length, the passageway shall not be limited in 
length. 

306.4.1 Electrical requirements. A luminaire controlled 
by a switch located at the required passageway opening and 
a receptacle outlet shall be provided at or near the appliance 
location in accordance with the Electrical Code. 

306.5 Equipment and appliances on roofs or elevated struc- 
tures. Where equipment and appliances requiring access are 
installed on roofs or elevated structures at a height exceeding 
16 feet (4877 mm), such access shall be provided by a perma- 
nent approved means of access, the extent of which shall be 
from grade or floor level to the equipment and appliances' level 
service space. Such access shall not require climbing over 
obstructions greater than 30 inches (762 mm) high or walking 



on roofs having a slope greater than 4 units vertical in 12 units 
horizontal (3 3 -percent slope). 

Permanent ladders installed to provide the required access 
shall comply with the following minimum design criteria: 

1 . The side railing shall extend above the parapet or roof 
edge not less than 30 inches (762 mm). 

2. Ladders shall have rung spacing not to exceed 14 inches 
(356 mm) on center. 

3. Ladders shall have a toe spacing not less than 6 inches 
(152 mm) deep. 

4; There shall be a minimum of 18 inches (457 mm) 
between rails. 

5. Rungs shall have a minimum 0.75-inch (19 mm) diame- 
ter and be capable of withstanding a 300-pound (136.1 
kg) load. 

6. Ladders over 30 feet (9144 mm) in height shall be pro- 
vided with offset sections and landings capable of with- 
standing 100 pounds (488.2 kg/m^) per square foot. 

7. Ladders shall be protected against corrosion by 
approved means. 

Catwalks installed to provide the required access shall be not 
less than 24 inches (610 mm) wide and shall have railings as 
required for service platforms. 

Exception: This section shall not apply to the replacement, 
repair or maintenance of an existing appliance or piece of 
equipment lawfully in existence at the time of the adoption 
of this code. 

306.6 Sloped roofs. Where appliances, equipment, fans or 
other components that require service are installed on a roof 
having a slope of three units vertical in 12 units horizontal 
(25 -percent slope) or greater and having an edge more than 30 
inches (762 mm) above grade at such edge, a level platform 
shall be provided on each side of the appliance to which access 
is required for service, repair or maintenance. The platform 
shall be not less than 30 inches (762 mm) in any dimension and 
shall be provided with guards. The guards shall extend not less 
than 42 inches (1067 mm) above the platform, shall be con- 
structed so as to prevent the passage of a 21-inch-diameter (533 
mm) sphere and shall comply with the loading requirements 
for guards specified in the Building Code. 

Exception: This section shall not apply to the replacement, 
repair or rnaintenance of an existing appliance or piece of 
equipment lawfully in existence at the time of the adoption 
of this code. 



SECTION 307 
CONDENSATE DISPOSAL 

307.1 Fuel-burning appliances. Liquid combustion by-prod- 
ucts of condensing appliances shall be collected and dis- 
charged to an approved plumbing fixture or disposal area in 
accordance with the manufacturer's installation instructions. 
Condensate piping shall be of approved corrosion-resistant 
material and shall not be smaller than the drain connection on 
the appliance. Such piping shall maintain a minimum horizon- 
tal slope in the direction of discharge of not less than 



2007 OREGON MECHANICAL SPECIALTY CODE 



27 



GENERAL REGULATIONS 



one-eighth unit vertical in 12 units horizontal (1 -percent 
slope). 

307.2 Evaporators and cooling coils. Condensate drain sys- 
tems shall be provided for equipment and appliances contain- 
ing evaporators or cooling coils. Condensate drain systems 
shall be designed, constructed and installed in accordance with 
Sections 307.2.1 through 307.2.4. 

3§7.2ol Condensate disposal. Condensate from all cooling 
coils and evaporators shall be conveyed from the drain pan 
outlet to an approved place of disposal as follows: 

1. Units larger than 6 tons (21.1 kW) nominal capacity 
shall dischai'ge to a sanitary sewer drain or storm 
sewer drain. Where discharging to a sanitary sewer, 
such drains shall be indirectly connected in accor- 
dance with the Plumbing Code. 

2. Units 6 tons (21.1 kW) and smaller nominal capacity 
shall discharge in accordance with Item 1 , or shall dis- 
charge to a gutter, roof drain or other approved loca- 
tion. 

3. Condensate drains from rooftop units shall discharge 
in accordance with Item 1 or 2, or shall discharge onto 
rooftops where the condensate does not discharge 
into a street, alley or other areas so as to cause a nui- 
sance. 

3®7.2.2 Drain pipe materials and sizes. Components of 
the condensate disposal system shall be cast iron, galva- 
nized steel, copper, cross-linked polyethylene, 
polybutylene, polyethylene, ABS, CPVC or PVC pipe or 
tubing. All components shall be selected for the pressure 
and temperature rating of the installation. Condensate waste 
and drain line size shall be not less than V4-inch (19 mm) 
internal diameter and shall not decrease in size from the 
drain pan connection to the place of condensate disposal. 
Where the drain pipes from more than one unit are 
manifolded together for condensate drainage, the pipe or 
tubing shall be sized in accordance with an approved 
method. All horizontal sections of drain piping shall be 
installed in uniform alignment at a uniform slope. 

307.2.3 Auxiliary and secondary drain systems. In addi- 
tion to the requirements of Section 307.2.1, a secondary 
drain or auxiliary drain pan shall be required for each cool- 
ing or evaporator coil or fuel-fired appliance that produces 
condensate, where damage to any building components will 
occur as a result of overflow from the equipment drain pan 
or stoppage in the condensate drain piping. One of the fol- 
lowing methods shall be used: 

1 . An auxiliary drain pan with a separate drain shall be 
provided under the coils on which condensation will 
occur. The auxiliary pan drain shall discharge to a 
conspicuous point of disposal to alert occupants in the 
event of a stoppage of the primary drain. The pan shall 
have a minimum depth of 1.5 inches (38 mm), shall 
not be less than 3 inches (76 mm) larger than the unit 
or the coil dimensions in width and length and shall be 
constructed of corrosion-resistant material. Metallic 
pans shall have a minimum thickness of not less than 
0.0276-inch (0.7 mm) galvanized sheet metal. Non- 



metaUic pans shall have a minimum thickness of not 
less than 0.0625 inch (1.6 mm). 

2. A separate overflow drain line shall be connected to 
the drain pan provided with the equipment. Such 
overflow drain shall discharge to a conspicuous point 
of disposal to alert occupants in the event of a stop- 
page of the primary drain. The overflow drain line 
shall connect to the drain pan at a higher level than the 
primary drain connection. 

3. An auxiliary drain pan without a separate drain line 
shall be provided under the coils on which condensate 
will occur. Such pan shall be equipped with a 
water-level detection device conforming to UL 508 
that will shut off the equipment served prior to over- 
flow of the pan. The auxiliary drain pan shall be con- 
structed in accordance with Item 1 of this section. 

4. A water level detection device conforming to UL 508 
shall be provided that will shut off the equipment 
served in the event that the primary drain is blocked. 
The device shall be installed in the primary drain line, 
the overflow drain line, or in the equipment-supplied 
drain pan, located at a point higher than the primary 
drain line connection and below the overflow rim of 
such pan. 

Exception: Fuel-fired appliances that automatically 
shut down operation in the event of a stoppage in the 
condensate drainage system. 

307.2.3.1 Water-level monitoring devices. On 
down-flow units and all other coils that do not have a sec- 
ondary drain and do not have a means to install an auxil- 
iary drain pan, a water-level monitoring device shall be 
installed inside the primary drain pan. This device shall 
shut off the equipment served in the event that the pri- 
mary drain becomes restricted. Externally installed 
devices and devices installed in the drain hne shall not be 
permitted. 

307.2.4 Traps. Condensate drains shall be trapped as 
required by the equipment or appliance manufacturer. 



SECTION 308 
CLEARANCE REDUCTION 

308.1 Scope. This section shall govern the reduction in 
required clearances to combustible materials and combustible 
assemblies for chimneys, vents, kitchen exhaust equipment, 
mechanical appliances, and mechanical devices and equip- 
ment. 

308.2 Listed appliances and equipment. The reduction of the 
required clearances to combustibles for listed and labeled 
appliances and equipment shall be in accordance with the 
requirements of this section except that such clearances shall 
not be reduced where reduction is specifically prohibited by the 
terms of the appliance or equipment listing. 

Exception: Unlisted appliances and equipment, when 
approved by the building official, shall be in accordance 
with an approved nationally recognized standard. 



28 



2007 OREGON MECHANICAL SPECIALTY CODE 



GENERAL REGULATIONS 



308.3 Protective assembly construction and installation. 

Reduced clearance protective assemblies, including structural 
and support elements, shall be constructed of noncombustible 
materials. Spacers utilized to maintain an airspace between the 
protective assembly and the protected material or assembly 
shall be noncombustible. Where a space between the protective 
assembly and protected combustible material or assembly is 
specified, the same space shall be provided around the edges of 
the protective assembly and the spacers shall be placed so as to 
allow air circulation by convection in such space. Protective 
assemblies shall not be placed less than 1 inch (25 mm) from 
the mechanical appliances, devices or equipment, regardless of 
the allowable reduced clearance. 

308.4 Allowable reduction. The reduction of required clear- 
ances to combustible assemblies or cornbustible materials shall 
be based on the utilization of a reduced clearance protective 
assembly in accordance with Section 308.5 or 308.6. 

308.5 Labeled assemblies. The allowable clearance reduction 
shall be based on an approved reduced clearance protective 



assembly that has been tested and bears the label of an 
approved agency. 

308.6 Reduction table. The allowable clearance reduction 
shall be based on one of the methods specified in Table 308.6. 
Where required clearances are not listed in Table 308.6, the 
reduced clearances shall be determined by linear interpolation 
between the distances listed in the table. Reduced clearances 
shall not be derived by extrapolation below the range of the 
table. 

308.7 Solid fuel-burning appliances. The clearance reduction 
methods specified in Table 308.6 shall not be utilized to reduce 
the clearance required for solid fuel-burning appliances that 
are labeled for installation with clearances of 12 inches (305 
mm) or less. Where appliances are labeled for installation with 
clearances of greater than 12 inches (305 mm), the clearance 
reduction methods of Table 308.6 shall not reduce the clear- 
ance to less than 12 inches (305 mm). 

308.8 Masonry chimneys. The clearance reduction methods 
specified in Table 308.6 shall not be utilized to reduce the clear- 



TABLE 308.6 
CLEARANCE REDUCTION METHODS 



TYPE OF PROTECTIVE ASSEMBLY^ 


REDUCED CLEARANCE WITH PROTECTION (inches^ 


Horizontat combusti ble assemblies 
located above the heat source 


Horizontal combustible assemblies 

located beneath the heat source and all 

vertical combustible assemblies 


Required clearance to combustibles 
without protection (inches)^ 


Required clearance to combustibles 
without protection (inches)^ 


36 


18 


9 


6 


36 


18 


9 


6 


Galvanized sheet metal, minimum nominal thickness of 0.024 
inch (No. 24 Gage), mounted on 1-inch glass fiber or mineral 
wool batt reinforced with wire on the back, 1 inch off the 
combustible assembly 


18 


9 


5 


3 


12 


6 


3 


3 


Galvanized sheet metal, minimum nominal thickness of 0.024 
inch (No. 24 Gage), spaced 1 inch off the combustible 
assembly 


18 


9 


5 


3 


12 


6 


3 


2 


Two layers of galvanized sheet metal, minimum nominal 
thickness of 0.024 inch (No. 24 Gage), having a 1-inch 
airspace between layers, spaced 1 inch off the combustible 
assembly 


18 


9 


5 


3 


12 


6 


3 


3 


Two layers of galvanized sheet metal, minimum nominal 
thickness of 0.024 inch (No. 24 Gage), having 1 inch of 
fiberglass insulation between layers, spaced 1 inch off the 
combustible assembly 


18 


9 


5 


3 


12 


6 


3 


3 


0.5-inch inorganic insulating board, over 1 inch of fiberglass or 
mineral wool batt, against the combustible assembly 


24 


12 


6 


4 


18 


9 


5 


3 


3.5-inch brick wall, spaced 1 inch off the combustible wall 


— 


— 


— 


— 


12 


6 


6 


6 


3.5-inch brick wall, against the combustible wall 














24 


12 


6 


5 


Prefabricated brick 1 Vg-inch thick spaced out 1 inch and 
ventilated. 


30 


15 


9 


3 


18 


9 


6 


3 



For SI: 1 inch = 25.4 mm, °C = [(°F)-32]/1.8, 1 pound per cubic foot = 16.02 kgAn^ 1.0 Btu ■ in/ft^ • h . °F = 0.144 W/m^ • K. 

a. Mineral wool and glass fiber batts (blanket or board) shall have a minimum density of 8 pounds per cubic foot and a minimum melting point of 1 ,500°F. Insulation 

material utilized as part of a clearance reduction system shall have a thermal conductivity of 1.0 Btu • in./(ft^ -h • °F) or less. Insulation board shall be formed of 

noncombustible material. 



2007 OREGON MECHANICAL SPECIALTY CODE 



29 



GENERAL REGULATIONS 



ances required for masonry chimneys as specified in Chapter 8 
and the Building Code. 

308.9 ClhimEey coneector pass-tlhroiuiglhis. The clearance 
reduction methods specified in Table 308.6 shall not be utilized 
to reduce the clearances required for chimney connector 
pass-throughs as specified in Section 803.10.4. 

308.1(01 Masonry lElreplaces. The clearance reduction methods 
specified in Table 308.6 shall not be utilized to reduce the clear- 
ances required for masonry fireplaces as specified in Chapter 8 
and the Building Code. 

308.11 Kitelheini exhaiiist dmcits. The clearance reduction meth- 
ods specified in Table 308.6 shall not be utiHzed to reduce the 
minimum clearances required by Section 506.3.10 for kitchen 
exhaust ducts enclosed in a shaft. 

> 



30 2007 OREGON IVJECHANICAL SPECIALTY CODE 



CHAPTER 4 

VENTILATION 



SECTION 401 
GENERAL 

401.1 Scope. This chapter shall govern the ventilation of 
spaces within a building intended to be occupied. This chapter 
does not govern the requirements for smoke control systems. 
The principles specified in ASHRAE Standard 62-2001 may 
be used as an alternate to this chapter to demonstrate compli- 
ance with required ventilation air for occupants. 

401.2 Veetilatiom required. Every occupied space shall be 
I I ventilated by natural means in accordance with Chapter 12 of 
^ the Building Code or by mechanical means in accordance with 

Section 403. 



Note: Heating and air conditioning controls shall conform to Chap- 
ter 13 of the Oregon Structural Specialty Code. 



401.3 When required. Ventilation shall be provided during the 
periods that the room or space is occupied. 

401.4 Opening location. Outdoor air exhaust and intake open- 
ings shall be located a minimum of 10 feet (3048 mm) from lot 
lines or buildings on the same lot. Where openings front on a 
street or public way, the distance shall be measured to the cen- 
terline of the street or public way. 

Exceptions: 

1. Group R-3. 

2. Exhaust outlets for environmental air exhaust open- 
ings shall be located not less than 3 feet (914 mm) 
from property lines and not less than 3 feet (914 mm) 
from openings into the building. 

401.4.1 Intake openings. Mechanical and gravity outdoor 
air intake openings shall be located a minimum of 10 feet 
(3048 mm) horizontally from any hazardous or noxious 
contaminant source, such as vents, chimneys, plumbing 
vents, streets, alleys, parking lots, gas meters and loading 
docks, except as otherwise specified in this code. Where a 
source of contaminant is located within 10 feet (3048 mm) 
horizontally of an intake opening, such opening shall be 
located a minimum of 2 feet (610 mm) below the contami- 
nant source. 

The exhaust from a bathroom or kitchen in a residential 
dwelling shall not be considered to be a hazardous or nox- 
ious contaminant. 

401.4.2 Exhaust openings. Outdoor exhaust openings shall 
be located so as not to create a nuisance. Exhaust air shall 
not be directed onto walkways. 

401.4.3 Flood hazard. For structures located in flood haz- 
ard areas, outdoor exhaust openings shall be at or above the 
design flood elevation. 



401.5 Outdoor opening protection. Air exhaust and intake 
openings that terminate outdoors shall be protected with corro- 
sion-resistant screens, louvers or grilles. Openings in louvers, 
grilles and screens shall be sized in accordance with Table 
401.5, and shall be protected against local weather conditions. 
Outdoor air exhaust and intake openings located in exterior 
walls shall meet the provisions for exterior wall opening 
protectives in accordance with the Building Code. 

TABLE 401 .5 

OPENING SIZES IN LOUVERS, GRILLES AND 

SCREENS PROTECTING OUTDOOR EXHAUST 

AND AIR INTAKE OPENINGS 



OUTDOOR OPENING TYPE 


MINIMUM AND MAXIMUM OPENING 

SIZES IN LOUVERS, GRILLES AND 

SCREENS MEASURED IN ANY 

DIRECTION 


Exhaust openings 


Not < '/4 inch and not > V2 inch 


Intake openings in residential 
occupancies 


Not < V4 inch and not > V2 inch 


Intake openings in other than 
residential occupancies 


> V4 inch and not > 1 inch 



For SI: 1 inch = 25.4 mm. 

401.6 Contaminant sources. Stationary local sources produc- 
ing air-borne particulates, heat, odors, fumes, spray, vapors, 
smoke or gases in such quantities as to be irritating or injurious 
to health shall be provided with an exhaust system in accor- 
dance with Chapter 5 or a means of collection and removal of 
the contaminants. Such exhaust shall discharge directly to an 
approved location at the exterior of the building. 



SECTION 402 
NATURAL VENTILATION 

(See Chapter 12 of the Oregon Structural Specialty Code) 

SECTION 403 
MECHANICAL VENTILATION 

403.1 Ventilation system. Mechanical ventilation shall be pro- 
vided by a method of supply air and return or exhaust air. The 
amoiint of supply air shall be approximately equal to the 
amount of return and exhaust air. The system shall not be pro- 
hibited from producing negative or positive pressure. The sys- 
tem to convey ventilation air shall be designed and installed in 
accordance with Chapter 6. 

Ventilation supply systems shall be designed to deliver the 
required rate of supply air to the occupied zone within an occu- 
pied space. The occupied zone shall have boundaries measured 
at 3 inches (76 mm) and 72 inches (1829 mm) above the floor 
and 24 inches (610 mm) from the enclosing walls. 



2007 OREGON WIECHANICAL SPECIALTY CODE 



31 



VENTILATION 



403.2 Outdoor air required. The minimum ventilation rate of 
outdoor air shall be determined in accordance with Section 
403.3. 

Exception!: Where the registered design professional dem- 
onstrates that an engineered ventilation system design will 
prevent the maximum concentration of contaminants from 
exceeding that obtainable by the rate of outdoor air ventila- 
tion determined in accordance with Section 403.3, the mini- 
mum required rate of outdoor air shall be reduced in 
accordance with such engineered system design. 



L2.1 Recirculation of air. The air required by Section 
403 . 3 shall not be recirculated. Air in excess of that required by 
Section 403.3 shaU not be prohibited from being recirculated 
as a component of supply air to building spaces, except that: 

1. Ventilation air shall not be recirculated from one 
dwelling to another or to dissimilar occupancies. 

2. Supply air to a swimming pool and associated deck 
areas shall not be recirculated unless such air is dehu- 
midified to maintain the relative humidity of the area 
at 60 percent or less. Air from this area shall not be 
recirculated to other spaces where 10 percent or more 
of the resulting supply airstream consists of air 
recirculated from these spaces. 

3. Where mechanical exhaust is required by Note b in 
Table 403.3, recirculation of air from such spaces 
shall be prohibited. All air supplied to such spaces 
shall be exhausted, including any air in excess of that 
required by Table 403.3. 

4. Where mechanical exhaust is required by Note h in 
Table 403.3, mechanical exhaust is required and 
recirculation is prohibited where 10 percent or more 
of the resulting supply airstream consists of air 
recirculated from these spaces. 



> 403.2.2 Transfer air. Air transferred from occupied spaces is 
not prohibited from serving as makeup air for required 
exhaust systems in such spaces as kitchens, baths, toilet 
rooms, elevators and smoking lounges. The amount of trans- 
fer air and exhaust air shall be sufficient to provide the flow 
rates as specified in Sections 403.3 and 403.3. 1 . The required 
outdoor air rates specified in Table 403.3 shall be introduced 
directly into such spaces or into the occupied spaces from 
which air is transferred or a combination of both. 

Exceptions: 

1. Where recirculation from such spaces is prohib- 
ited by Table 403.3. 

2. Air transferred from spaces served by other fan 
systems shall not be used if those systems are 
required to meet either Section 401.6 of this code 
or Section 13 17.2.2 or 1 3 1 8.3 of the Oregon Struc- 
tural Specialty Code. 

3. Where the ventilation schedule of HVAC system 
supplying transfer air is not similar to the exhaust 
system operating schedule. 

403.3 Ventilation rate. Ventilation systems shall be designed to 
have the capacity to supply the minimum outdoor airflow rate 
determined in accordance with Table 403.3 based on the occu- 



pancy of the space and the occupant load or other parameter as 
stated therein. The occupant load utilized for design of the venti- 
lation system shall be based on expected average occupant load 
provided the average occupant load is not less than one-half the 
number determined from the estimated maximum occupant load 
rate indicated in Table 403.3. The anticipated ventilation occu- 
pancy load and occupancy ventilation design methods shall be 
documented on plans and specifications. The ventilation system 
shall be designed to supply the required rate of ventilation air 
continuously during the period the building is occupied, except 
as otherwise stated in other provisions of the code. 

Exception: The occupant load is not required to be deter- 
mined, based on the estimated maximum occupant load rate 
indicated in Table 403.3 where approved statistical data docu- 
ment the accuracy of an alternate anticipated occupant density. 

403.3.1 System operation. The minimum flow rate of out- 
door air that the ventilation system must be capable of sup- 
plying during its operation shall be permitted to be based on 
the rate per person indicated in Table 403.3 and the actual 
number of occupants present. 

403.3.2 Common ventilation system. Where spaces hav- 
ing different ventilation rate requirements are served by a 
common ventilation system, the ratio of outdoor air to total 
supply air for the system shall be determined based on the 
space having the largest outdoor air requirement or shall be 
determined in accordance with the following formula: 



Y = 



X 



(1+X-Z) 



(Equation 4-1) 



where 



Y= Yot^st - Corrected fraction of outdoor air in system 
supply. 

X = Yon^st - Uncorrected fraction of outdoor air in sys- 
tem supply. 

Z = V,,^ /\/ ^ = Fraction of outdoor air in critical space. The 
critical space is that space with the greatest 
required fraction of outdoor air in the supply 
to this space. 

V^, = Corrected total outdoor airflow rate. 

y,j = Total supply flow rate, i.e., the sum of all supply for 
all branches of the system. 

Vg„ = Simiofoutdoor airflow rates for all branches on system. 

Voc = Outdoor airflow rate required in critical spaces. 

Vjc = Supply flow rate in critical space. 

403.3.3 Variable air volume system control. Variable air 
volume air distribution systems, other than those designed 
to supply only 100-percent outdoor air, shall be provided 
with controls to regulate the flow of outdoor air. Such con- 
trol system shall be designed to maintain the flow of outdoor 
air at a rate of not less than that required by Section 403 over 
the entire range of supply air operating rates. 

403.3.4 Balancing. Ventilation systems shall be balanced 
by an approved method. Such balancing shall verify that the 
ventilation system is capable of supplying the airflow rates 
required by Section 403. 



32 



2007 OREGON MECHANICAL SPECIALTY CODE 



VENTILATION 



TABLE 403.3 
REQUIRED OUTDOOR VENTILATION AIR 



TABLE 403.3— continued 
REQUIRED OUTDOOR VENTILATION AIR 





ESTIMATED 






MAXIMUM 


OUTDOOR AIR 




OCCUPANT LOAD, 


[Cubic feet per 




PERSONS PER 


minute (cfm) per 


OCCUPANCY 


1,000 SQUARE 


person] UNLESS 


CLASSIFICATION 


FEEr 


NOTED^ 


Correctional facilities 






Cells 






widiout plumbing fixtures 


20 


20 


with plumbing fixtures^' ^ 


20 


20 


Dining halls 


100 


15 


Guard stations 


40 


15 


Dry cleaners, laundries 






Coin-operated dry cleaner 


20 


15 


Coin-operated laundries 


20 


15 


Commercial dry cleaner 


30 


30 


Commercial laundry 


10 


25 


Storage, pick up 


30 


35 


Education 






Auditoriums 


150 


15 


Classrooms 


50 


15 


Corridors 


— 


O.lOcfm/ft^ 


Laboratories 


30 


20 


Libraries 


20 


15 


Locker rooms'^ 


— 


0.50 cfm/ft^ 


Music rooms 


50 


15 


Smoking lounges'''^ 


70 


60 


Training shops 


30 


20 


Food and beverage service 






Bars, cocktail lounges 


100 


30 


Cafeteria, fast food 


100 


20 


Dining rooms 


70 


20 


Kitchens (cooking)^'^ 


20 


15 


Hospitals, nursing and 






convalescent homes 






Autopsy rooms'' 


— 


0.50cfm/ft2 


Medical procedure rooms 


20 


15 


Operating rooms 


20 


30 


Patient rooms 


10 


25 


Physical therapy 


20 


15 


Recovery and ICU 


20 


15 


Hotels, motels, resorts and 






dormitories 






Assembly rooms 


120 


15 


Bathrooms^' ^ 


— 


35 


Bedrooms 


— 


30 cfm per room 


Conference rooms 


50 


20 


Dormitory sleeping areas 


20 


15 


Gambling casinos 


120 


30 


Living rooms 


— 


30 cfm per room 


Lobbies 


30 


15 


Offices 






Conference rooms 


50 


20 


Office spaces 


7 


20 


Reception areas 


60 


15 


Telecommunication centers 






and data entry 


60 


20 



(continued) 





ESTIMATED 






MAXIMUM 


OUTDOOR AIR 




OCCUPANT 


(Cubic feet per 




LOAD, PERSONS 


minute (cfm) 


OCCUPANCY 


PER 1,000 


per person) 


CLASSIFICATION 


SQUARE FEEr 


UNLESS NOTED= 


Private dwellings, single and 






multiple 






Garages, common for 
multiple units'' 


— 


1.5cfm/ft2 






Garages, separate for 
each dwelling 


— 


100 cfm per car 


Kitchens^ 




100 cfm 

intermittent or 25 

cfm continuous 


Living areas'^ 


, Based upon 
number of 
bedrooms, first 


0.35 air changes 
perhour^or 15 cfm 




bedroom: 2; each 


per person, 
whichever is 




additional 






bedroom: 1 


greater 


Toilet rooms and 


— 


Mechanical 


bathrooms^' '' 




exhaust capacity of 

50 cfm intermittent 

or 20 cfm 

continuous 


Public spaces 






Corridors and utilities 


— 


0.05 cfm/ft^ 


Elevator car^ 


— 


l.OOcfm/ft^ 


Locker rooms'* 




0.5 cfm/ft^ 


Shower rooms 




50 cfm 


(per shower head)^'*' 




intermittent or 20 
cfm continuous 


Smoking lounges'''^ 


70 


60 


Toilet roomsS''' 




75 cfm per water 
closet or urinal 


Retail stores, sales floors and 






showroom floors 






Basement and street 


— 


0.30 cfm/ft^ 


Dressing rooms 


— 


0.20 cfm/ft^ 


Malls and arcades 


— 


0.20 cfm/ft2 


Shipping and receiving 


— 


0.15cfm/ft2 


Smoking lounges'' 


70 


60 


Storage rooms 


— 


0.15cfm/ft2 


Upper floors 


— 


0.20 cfm/ft^ 


Warehouses 


— 


0.05 cfm/ft2 


Specialty shops 






Automotive motor- 






fuel-dispensing stations 


— 


1.5 cfm/ft^ 


Barber 


25 


15 


Beauty 


25 


25 


Clothiers, furniture 


— 


0.30 cfm/ft^ 


Embalming room'' 




2.0 cfm/ft^ 


Florists 


8 


15 


Hardware, drugs, fabrics 


8 


15 



(continued) 



2007 OREGON MECHANICAL SPECIALTY CODE 



33 



VENTILATJON 



TABLE 403.3— continued 
REQUIRED OUTDOOR VENTILATION MR 





ESTIMATED 






MAXIMUM 


OUTDOOR AIR 




OCCUPANT 


(Cubic feet per 




LOAD, PERSONS 


minute (cfm) 


OCCUPANCY 


PER 1,000 


per person) 


CLASSIFICATION 


SQUARE FEEr 


UNLESS NOTED^ 


Specialty shops — continued 










50 cfm 






intermittent or 20 






cfm continuous 


Nail salon''' ' 




per station 


Pet shops 


— 


l.OOcfm/ft^ 


Reducing salons 


20 


15 


Supermarkets 


8 


15 


Sports and amusement 






Ballrooms and discos 


100 


25 


Bowling alleys (seating areas) 


70 


25 


Game rooms 


70 


25 


Ice arenas 


— 


0.50 cfm/ft^ 


Playing floors (gymnasiums) 


30 


20 


Spectator areas 


150 


15 


Swimming pools (pool and deck 






area) 


— 


0.50 cfm/ft^ 


Storage 






Repair garages, enclosed 






parking garages'* 


— 


1.5cfm/ft2 


Warehouses 


— 


0.05 cfm/ft^ 


Theaters 






Auditoriums 


150 


15 


Lobbies 


150 


20 


Stages, studios 


70 


15 


Ticket booths 


60 


20 


Transportation 






Platforms 


100 


15 


Vehicles 


150 


15 


Waiting rooms 


100 


15 


Workrooms 






Bank vaults 


5 


15 


Darkrooms 


— 


0.50 cfm/ft^ 


Duplicating, printing 


— 


0.50 cfm/ft^ 


Meat processing'^ 


10 


15 


Pharmacy 


20 


15 


Photo studios 


10 


15 



For SI: 1 cubic foot per minute = 0.00047 19 m^/s, 1 ton = 908 kg, 

1 cubic foot per minute per square foot = 0.00508 m^/(s • m^), 
°C = [(T) -32]/l .8, 1 square foot = 0.0929 m^. 

a. Based upon net floor area. 

b. Mechanical exhaust required and the recirculation of air from such spaces as 
permittedby Section 403.2.1 is prohibited(see Section 403.2.1, Items 1 and3). 

c. Spaces unheated or maintained below 50°F are not covered by these require- 
ments unless the occupancy is continuous. 

d. Ventilation systems in enclosed parking garages shall comply with Section 
404. 

e. Where the ventilation rate is expressed in cfm/ft^, such rate is based upon 
cubic feet per minute per square foot of the floor area being ventilated. 

f. The sum of the outdoor and transfer air from adjacent spaces shall be suffi- 
cient to provide an exhaust rate of not less than 1.5 cfm/ft^. 

g. Transfer air permitted in accordance with Section 403.2.2. 

h. Mechanical exhaust is required and recirculation is prohibited except that 
recirculation shall be permitted where the resulting supply airstream con- 
sists of not more than 10 percent air recirculated from these spaces (see Sec- 
tion 403.2.1, Items 2 and 4). 

i. The required exhaust system shall capture the contaminants and odors at 
their source. 



SECTBOM 404 
ENCLOSED PARKING GARAGES 

404.1 Enclosed parking garages. Mechanical ventilation sys- 
tems for enclosed parking garages shall be permitted to operate 
intermittently where the system is arranged to operate automat- 
ically upon detection of vehicle operation or the presence of 
occupants by approved automatic detection devices. 

404.1.1 Enclosed parking garage ventiilatiom controls. 
See Section 1317.2.3 of the Oregon Structural Specialty 
Code. 

404.2 Minimum ventilation. Automatic operation of the sys- 
tem shall not reduce the ventilation rate below 0.05 cfm per 
square foot (0.00025 mVs • m^) of the floor area and the system 
shall be capable of producing a ventilation rate of 1.5 cfm per 
square foot (0.0076m^/s • m^) of floor area. 

404.3 Occupied spaces accessory to public garages. Con- 
necting offices, waiting rooms, ticket booths and similar uses 
that are accessory to a public garage shall be maintained at a 
positive pressure and shall be provided with ventilation in 
accordance with Section 403.3. 



SECTION 405 
SYSTEMS CONTROL 

405.1 General. Mechanical ventilation systems shall be pro- 
vided with manual or automatic controls that will operate such 
systems whenever the spaces are occupied. Air-conditioning 
systems that supply required ventilation air shall be provided 
with controls designed to automatically maintain the required 
outdoor air supply rate during occupancy. 

405.1.1 Ventilation controls for high occupancy areas. 
See Section 1317.2.2 of the Oregon Structural Specialty 
Code. 



SECTION 406 
VENTILATION OF UNINHABITED SPACES 

406.1 General. Uninhabited spaces, such as crawl spaces and 
attics, shall be provided with natural ventilation openings as 
required by the Building Code or shall be provided with a 
mechanical exhaust and supply air system. The mechanical 
exhaust rate shall be not less than 0.02 cfm. per square foot 
(0.00001 mVs • m^) of horizontal area and shall be automati- 
cally controlled to operate when the relative humidity in the 
space served exceeds 60 percent. 



34 



2007 OREGON MECHANICAL SPECIALTY CODE 



CHAPTER 5 

EXHAUST SYSTEMS 



SECTION 501 
GENERAL 

501.1 Scope. This chapter shall govern the design, construc- 
tion and installation of mechanical exhaust systems, including 
dust, stock and refuse conveyor systems, exhaust systems serv- 
ing commercial cooking appliances and energy recovery venti- 
lation systems. 

501.2 Exhaust discharge. The air removed by every mechani- 
cal exhaust system shall be discharged outdoors at a point 
where it will not cause a nuisance and not less than the dis- 
tances specified in Section 501 .2. 1 . The air shall be discharged 
to a location from which it cannot again be readily drawn in by 
a ventilating system. Air shall not be exhausted into an attic or 
crawl space. 

Exceptions: 

1 . Whole-house ventilation-type attic fans shall be per- 
mitted to discharge into the attic space of dwelMng 
units having private attics. 

2. Commercial cooking recirculating systems. 

501.2.1 Location of exhaust outlets. The termination point 
of exhaust outlets and ducts discharging to the outdoors 
shall be located with the following minimum distances: 

1 . For ducts conveying explosive or flammable vapors, 
fumes or dusts: 30 feet (9144 mm) from property 
lines; 10 feet (3048 mm) from operable openings into 
buildings; 6 feet (1829 mm) from exterior walls and 
roofs; 30 feet (9144 mm) from combustible walls and 
operable openings into buildings which are in the 
direction of the exhaust discharge; 10 feet (3048 mm) 
above adjoining grade. 

2. For other product-conveying outlets: 10 feet (3048 
mm) from the property lines; 3 feet (914 mm) from 
exterior walls and roofs; 10 feet (3048 mm) from 
operable openings into buildings; 10 feet (3048 mm) 
above adjoining grade. 

3. For environmental air duct exhaust: 3 feet (914 mm) 
from property lines; 3 feet (914 mm) from operable 
openings into buildings for all occupancies other than 
Group U, and 10 feet (3048 mm) from mechanical air 
intakes. 

4. For specific systems: For clothes dryer exhaust, see 
Section 504.4; for kitchen hoods, see Section 506.3; 
for dust, stock and conveying systems, see Section 
511.2; and for subslab soil exhaust systems, see Sec- 
tion 512.4. 

501.3 Pressure equalization. Mechanical exhaust systems 
shall be sized to remove the quantity of air required by this 
chapter to be exhausted. The system shall operate when air is 
required to be exhausted. Where mechanical exhaust is 
required in a room or space in other than occupancies in R-3, 
such space shall be maintained with a neutral or negative pres- 



sure. If a greater quantity of air is supplied by a mechanical 
ventilating supply system than is removed by a mechanical 
exhaust for a room, adequate means shall be provided for the 
natural or mechanical exhaust of the excess air supplied. If only 
a mechanical exhaust system is installed for a room or if a 
greater quantity of air is removed by a mechanical exhaust sys- 
tem than is supplied by a mechanical ventilating supply system 
for a room, adequate make-up air consisting of supply air, 
transfer air or outdoor air shall be provided to satisfy the defi- 
ciency. The calculated building infiltration rate shall not be uti- 
lized to satisfy the requirements of this section. 

501.4 Ducts. Where exhaust duct construction is not specified 
in this chapter, such construction shall comply with Chapter 6. 



SECTION 502 
REQUIRED SYSTEMS 

502.1 General. An exhaust system shall be provided, main- 
tained and operated as specifically required by this section and 
for all occupied areas where machines, vats, tanks, furnaces, 
forges, salamanders and other appliances, equipment and pro- 
cesses in such areas produce or throw off dust or particles suffi- 
ciently light to float in the air, or which emit heat, odors, fumes, 
spray, gas or smoke, in such quantities so as to be irritating or 
injurious to health or safety. 

502.1.1 Exhaust location. The inlet to an exhaust system 
shall be located in the area of heaviest concentration of con- 
taminants. 

502.1.2 Fuel-dispensing areas. The bottom of an air inlet 
or exhaust opening in fuel-dispensing areas shall be located 
not more than 18 inches (457 mm) above the floor. 

502.1.3 Equipment, appliance and service rooms. Equip- 
ment, appliance and system service rooms that house 
sources of odors, fumes, noxious gases, smoke, steam, dust, 
spray or other contaminants shall be designed and con- 
structed so as to prevent spreading of such contaminants to 
other occupied parts of the building. 

502.1.4 Hazardous exhaust. The mechanical exhaust of 
high concentrations of dust or hazardous vapors shall con- 
form to the requirements of Section 510. 

502.2 Aircraft fueling and defueling. Compartments housing 
piping, pumps, air eliminators, water separators, hose reels and 
similar equipment used in aircraft fueling and defueling opera- 
tions shall be adequately ventilated at floor level or within the 
floor itself 

502.3 Battery-charging areas for powered industrial trucks 
and equipment. Ventilation shall be provided in an approved 
manner in battery-charging areas for powered industrial trucks 
and equipment to prevent a dangerous accumulation of flam- 
mable gases. 



2007 OREGON MECHANICAL SPECIALTY CODE 



35 



EXHAUST SYSTER/iS 



502.4 Statiomary storage battery systems. Stationary storage 
battery systems, as regulated by Section 608 of the Fire Code, 
shall be provided with ventilation in accordance with this chap- 
ter and Section 502.4.1 or 502.4.2. 

I Exceptiom; Lithium-ion batteries shall not require ventilation. 

I 502.4.1 Hydrogeo limit io rooms. For flooded lead acid, 
I flooded nickel cadmium and VRLA batteries, the ventila- 
tion system shall be designed to limit the maximum concen- 
tration of hydrogen to 1 .0 percent of the total volume of the 
room. 

502.4,2 Ventilatioo rate im rooms. Continuous ventilation 
shall be provided at a rate of not less than 1 cubic foot per 
minute per square foot (cfm/ft^) [0.00508 mV(s • m^)] of 
floor area of the room. 



>ll 



i-regiilated lead-acid batteries in cabinets. 
Valve-regulated lead-acid (VRLA) batteries installed in cabi- 
nets, as regulated by Section 608.6.2 of the Fire Code, shall be 
provided with ventilation in accordance with Section 502.5.1 
or 502.5.2. 

502.5.1 Hydrogen limit in cabinets. The cabinet ventila- 
tion system shall be designed to limit the maximum concen- 
tration of hydrogen to 1 .0 percent of the total volume of the 
cabinet during the worst-case event of simultaneous boost 
charging of all batteries in the cabinet. 

502.5.2 Ventilation rate in cabinets. Continuous cabinet 
ventilation shall be provided at a rate of not less than 1 cubic 
foot per minute per square foot (cfm/ft.^) [0.00508 mV(s • 
m^)] of the floor area covered by the cabinet. The room in 
which the cabinet is installed shall also be ventilated as 
required by Section 502.4.1 or 502.4.2. 

502.6 Dry cleaning plants. Ventilation in dry cleaning plants 
shall be in accordance with Sections 502.6.1 and 502.6.2. 



502.6.1 Type II systems. Type II dry cleaning systems shall 
be provided with a mechanical ventilation system that is 
designed to exhaust 1 cubic foot of air per minute for each 
square foot of floor area (1 cfm/ft-) [0.00508 mV(s • m^)] in 
dry cleaning rooms and in drying rooms. The ventilation 
system shall operate automatically when the dry cleaning 
equipment is in operation and shall have manual controls at 
an approved location. 



je IV and V systems. Type IV and V dry clean- 
ing systems shall be provided with an automatically acti- 
vated exhaust ventilation system to maintain a minimum of 
100 feet per minute (0.5 m/s) air velocity through the load- 
ing door when the door is opened. 

Exception: Dry cleaning units are not required to be pro- 
vided with exhaust ventilation where an exhaust hood is 
installed immediately outside of and above the loading 
door which operates at an airflow rate as follows: 

Q = 1 00 X A^o (Equation 5-1) 

where: 

Q = Flow rate exhausted through the hood, cubic feet 
per minute. 

^LD= Area of the loading door, square feet. 



502.6.3 Spotting and pretreating. Scrubbing tubs, scour- 
ing, brushing or spotting operations shall be located such 
that solvent vapors are captured and exhausted by the venti- 
lating system. 

502.7 Application of flammable finishes. Mechanical 
exhaust as required by this section shall be provided for opera- 
tions involving the application of flammable finishes. 

502.7.1 Limited spraying spaces. Positive mechanical 
ventilation which provides a minimum of six complete air 
changes per hour shall be installed in limited spraying 
spaces. Such system shall meet the requirements of the Fire 
Code for handling flammable vapors. Explosion venting is 
not required. 

502.7.2 Flammable vapor areas. Mechanical ventilation 
of flammable vapor areas shall be provided in accordance 
with Sections 502.7.2.1 through 502.7.2.6. 

502.7.2.1 Operation. Mechanical ventilation shall be 
kept in operation at all times while spraying operations 
are being conducted and for a sufficient time thereafter to 
allow vapors from drying coated articles and finishing 
material residue to be exhausted. Spraying equipment 
shall be interlocked with the ventilation of the flammable 
vapor area such that spraying operations cannot be con- 
ducted unless the ventilation system is in operation. 

502.7.2.2 Recirculation. Air exhausted from spraying 
operations shall not be recirculated. 

Exceptions: 

1. Air exhausted from spraying operations shall 
be permitted to be recirculated as makeup air 
for unmanned spray operations provided that: 

1.1. The solid particulate has been removed. 

1.2. The vapor concentration is less than 25 
percent of the lower flammable limit 
(LFL). 

1.3. Approved equipment is used to monitor 
the vapor concentration. 

1.4. An alarm is sounded and spray operations 
are automatically shut down if the vapor 
concentration exceeds 25 percent of the 
LFL. 

1 .5. In the event of shutdown of the vapor con- 
centration monitor, 100 percent of the air 
volume specified in Section 510 is auto- 
matically exhausted. 

2. Air exhausted from spraying operations is 
allowed to be recirculated as makeup air to 
manned spraying operations where all of the 
conditions provided in Exception 1 are 
included in the installation and documents have 
been prepared to show that the installation does 
not pose a life safety hazard to personnel inside 
the spray booth, spraying space or spray room. 

502.7.2.3 Air velocity. Ventilation systems shall be 
designed, installed and maintained such that the average 
air velocity over the open face of the booth, or booth cross 



< 



36 



2007 OREGON MECHANICAL SPECIALTY CODE 



EXHAUST SYSTEMS 



section in the direction of airflow during spraying opera- 
tions, is not less than 100 feet per minute (0.51 m/s). 

502.7.2.4 Ventilation obstruction. Articles being 
sprayed shall be positioned in a manner that does not 
obstruct collection of overspray. 

502.7.2.5 Independent ducts. Each spray booth and 
spray room shall have an independent exhaust duct sys- 
tem discharging to the outdoors. 

Exceptions: 

1 . Multiple spray booths having a combined fron- 
tal area of 18 square feet (1.67 m^) or less are 
allowed to have a common exhaust where iden- 
tical spray-finishing material is used in each 
booth. If more than one fan serves one booth, 
such fans shall be interconnected so that all fans 
operate simultaneously. 

2. Where treatment of exhaust is necessary for air 
pollution control or energy conservation, ducts 
shall be allowed to be manifolded if all of the 
following conditions are met: 

2.1. The sprayed materials used are compatible 
and will not react or cause ignition of the 
residue in the ducts. 

2.2. Nitrocellulose-based finishing material 
shall not be used. 

2.3. A filtering system shall be provided to 
reduce the amount of overspray carried 
into the duct manifold. 

2.4. Automatic sprinkler protection shall be pro- 
vided at the junction of each booth exhaust 
with the manifold, in addition to the protec- 
tion required by this chapter. 

502.7.2.6 Fan motors and belts. Electric motors driving 
exhaust fans shall not be placed inside booths or ducts. 
Fan rotating elements shall be nonferrous or nonsparking 
or the casing shall consist of, or be lined with, such mate- 
rial. Belts shall not enter the duct or booth unless the belt 
and pulley within the duct are tightly enclosed. 

502.7.3 Dipping operations. Flammable vapor areas of dip 
tank operations shall be provided with mechanical ventila- 
tion adequate to prevent the dangerous accumulation of 
vapors. Required ventilation systems shall be so arranged 
that the failure of any ventilating fan will automatically stop 
the dipping conveyor system. 

502.7.4 Electrostatic apparatus. The flammable vapor 
area in spray-finishing operations involving electrostatic 
apparatus and devices shall be ventilated in accordance with 
Section 502.7.2. 

502.7.5 Powder coating. Exhaust ventilation for pow- 
der-coating operations shall be sufficient to maintain the 
atmosphere below one-half of the minimum explosive con- 
centration for the material being applied. Nondeposited, 
air-suspended powders shall be removed through exhaust 
ducts to the powder recovery system. 



502.8 Hazardous materials — general requirements. 

Exhaust ventilation systems for structures containing hazard- 
ous materials shall be provided as required in Sections 502.8.1 
through 502.8.5. 

502.8.1 Storage in excess of the maximum allowable 
quantities. Indoor storage areas and storage buildings for 
hazardous materials in amounts exceeding the maximum 
allowable quantity per control area shall be provided with 
mechanical exhaust ventilation or natural ventilation where 
natural ventilation can be shown to be acceptable for the 
materials as stored. 

Exception: Storage areas for flammable solids comply- 
ing with Section 3604 of the Fire Code. 

502.8.1.1 System requirements. Exhaust ventilation 
systems shall comply with all of the following: 

1. The installation shall be in accordance with this 
code. 

2. Mechanical ventilation shall be provided at a rate 
of not less than 1 cfm per square foot [0.00508 
m3/(s • m^)] of floor area over the storage area. 

3. The systems shall operate continuously unless | 
alternate designs are approved. 

4. A manual shutoff control shall be provided outside 
of the room in a position adjacent to the access 
door to the room or in another approved location. 
The switch shall be a break-glass or other 
approved type and shall be labeled: VENTILA- 
TION SYSTEM EMERGENCY SHUTOFF. 

5. The exhaust ventilation shall be designed to con- 
sider the density of the potential fumes or vapors 
released. For fumes or vapors that are heavier than 
air, exhaust shall be taken from a point within 12 
inches (305 mm) of the floor. For fumes or vapors 
that are lighter than air, exhaust shall be taken from 
a point within 12 inches (305 mm) of the highest 
point of the room. 

6. The location of both the exhaust and inlet air open- 
ings shall be designed to provide air movement 
across all portions of the floor or room to prevent 
the accumulation of vapors. 

7. The exhaust air shall not be recirculated to occu- 
pied areas if the materials stored are capable of 
emitting hazardous vapors and contaminants have 
not been removed. Air contaminated with explo- 
sive or flammable vapors, fumes or dusts; flamma- 
ble, highly toxic or toxic gases; or radioactive 
materials shall not be recirculated. 

502.8.2 Gas rooms, exhausted enclosures and gas cabi- 
nets. The ventilation system for gas rooms, exhausted 
enclosures and gas cabinets for any quantity of hazardous 
material shall be designed to operate at a negative pressure 
in relation to the surrounding area. Highly toxic and toxic 
gases shall also comply with Sections 502.9.7.1, 502.9.7.2 
and 502.9.8.4. 

502.8.3 Indoor dispensing and use. Indoor dispensing and 
use areas for hazardous materials in amounts exceeding the 



2007 OREGON MECHANICAL SPECIALTY CODE 



37 



EXHAUST SYSTEMS 



maximum allowable quantity per control area shall be pro- 
vided with exhaust ventilation in accordance with Section 
502.7.1. 

Exception: Ventilation is not required for dispensing 
and use of flammable solids other than finely divided 
particles. 



502.8.4 Indoor dispensing and use — point sources. 
Where gases, liquids or solids in amounts exceeding the 
maximum allowable quantity per control area and having a 
hazard ranking of 3 or 4 in accordance with NFPA 704 are 
dispensed or used, mechanical exhaust ventilation shall be 
provided to capture gases, fumes, mists or vapors at the 
point of generation. 

Exception: Where it can be demonstrated that the gases, 
liquids or solids do not create harmful gases, fumes, 
mists or vapors. 

502.8.5 Closed systems. Where closed systems for the use 
of hazardous materials in amounts exceeding the maximum 
allowable quantity per control area are designed to be 
opened as part of normal operations, ventilation shall be 
provided in accordance with Section 502.8.4. 

502.9 Hazardous materials — requirements for specific 
materials. Exhaust ventilation systems for specific hazardous 
materials shall be provided as required in Section 502.8 and 
Sections 502.9.1 through 502.9.11. 

502.9.1 Compressed gases — medical gas systems. Rooms 
for the storage of compressed medical gases in amounts 
exceeding the maximum allowable exempt quantity per 
control area, and which do not have an exterior wall, shall be 
exhausted through a duct to the exterior of the building. 
Both separate airstreams shall be enclosed in a 1 -hour-rated 
shaft enclosure from the room to the exterior. Approved 
mechanical ventilation shall be provided at a minimum rate 
of 1 cfm/ft2 [0.00508 mV(s • m^)] of the area of the room. 

Gas cabinets for the storage of compressed medical gases 
in amounts exceeding the maximum allowable quantity per 
control area shall be connected to an exhaust system. The 
average velocity of ventilation at the face of access ports or 
windows shall be not less than 200 feet per minute (1.02 
m/s) with a minimum velocity of 150 feet per minute (0.76 
m/s) at any point at the access port or window. 

502.9.2 Corrosives. Where corrosive materials in amounts 
exceeding the maximum allowable quantity per control area 
are dispensed or used, mechanical exhaust ventilation in 
accordance with Section 502.8.4 shall be provided. 

502.9.3 Cryogenics. Storage areas for stationary or porta- 
ble containers of cryogenic fluids in any quantity shall be 
ventilated in accordance with Section 502.8. Indoor areas 
where cryogenic fluids in any quantity are dispensed shall 
be ventilated in accordance with the requirements of Sec- 
tion 502.8.4 in a manner that captures any vapor at the point 
of generation. 

Exception: Ventilation for indoor dispensing areas is not 
required where it can be demonstrated that the cryogenic 
fluids do not create harmful vapors. 



502.9.4 Explosives, Squirrel cage blowers shall not be used 
for exhausting hazardous fumes, vapors or gases in operat- 
ing buildings and rooms for the manufacture, assembly or 
testing of explosives. Only nonferrous fan blades shall be 
used for fans located within the ductwork and through 
which hazardous materials are exhausted. Motors shall be 
located outside the duct. 

502.9.5 Flammable and combustible liquids. Exhaust 
ventilation systems shall be provided as required by Sec- 
tions 502.9.5.1 through 502.9.5.5 for the storage, use, dis- 
pensing, mixing and handling of flammable and 
combustible liquids. Unless otherwise specified, this sec- 
tion shall apply to any quantity of flammable and combusti- 
ble liquids. 

Exception: This section shall not apply to flammable 
and combustible liquids that are exempt from the Fire 
Code. 

502.9.5.1 Vaults. Vaults that contain tanks of Class I liq- 
uids shall be provided with continuous ventilation at a 
rate of not less than 1 cfm/ft^ of floor area [0.00508 m3/(s 
• m^)], but not less than 150 cfm (4 mVmin). Failure of 
the exhaust airflow shall automatically shut down the 
dispensing system. The exhaust system shall be 
designed to provide air movement across all parts of the 
vault floor. Supply and exhaust ducts shall extend to a 
point not greater than 12 inches (305 mm) and not less 
than 3 inches (76 mm) above the floor. The exhaust sys- 
tem shall be installed in accordance with the provisions 
of NFPA 9 1 . Means shall be provided to automatically 
detect any flammable vapors and to automatically shut 
down the dispensing system upon detection of such 
flammable vapors in the exhaust duct at a concentration 
of 25 percent of the LFL. 

502.9.5.2 Storage rooms and warehouses. Liquid stor- 
age rooms and liquid storage warehouses for quantities 
of liquids exceeding those specified in the Fire Code 
shall be ventilated in accordance with Section 502.8.1. 

502.9.5.3 Cleaning machines. Areas containing 
machines used for parts cleaning in accordance with the 
Fire Code shall be adequately ventilated to prevent accu- 
mulation of vapors. 

502.9.5.4 Use, dispensing and mixing. Continuous 
mechanical vendlation shall be provided for the use, dis- 
pensing and mixing of flammable and combustible liq- 
uids in open or closed systems in amounts exceeding the 
maximum allowable quantity per control area and for 
bulk transfer and process transfer operations. The venti- 
lation rate shall be not less than 1 cfm/ft^ [0.00508 mV(s » 
m^)] of floor area over the design area. Provisions shall 
be made for the introduction of makeup air in a manner 
that will include all floor areas or pits where vapors can 
collect. Local or spot ventilation shall be provided where 
needed to prevent the accumulation of hazardous vapors. 

Exception: Where natural ventilation can be shown 
to be effective for the materials used, dispensed, or 
mixed. 



38 



2007 OREGON MECHANICAL SPECIALTY CODE 



EXHAUST SYSTEMS 



502.9.5.5 Bulk plants or terminals. Ventilation shall be 
provided for portions of properties where flammable and 
combustible liquids are received by tank vessels, pipe- 
lines, tank cars or tank vehicles and which are stored or 
blended in bulk for the purpose of distributing such liq- 
uids by tank vessels, pipelines, tank cars, tank vehicles or 
containers as required by Sections 502.9.5.5.1 through 
502.9.5.5.3. 

502.9.5.5.1 General. Ventilation shall be provided 
for rooms, buildings and enclosures in which Class I 
liquids are pumped, used or transferred. Design of 
ventilation systems shall consider the relatively high 
specific gravity of the vapors. Where natural ventila- 
tion is used, adequate openings in outside walls at 
floor level, unobstructed except by louvers or coarse 
screens, shall be provided. Where natural ventilation 
is inadequate, mechanical ventilation shall be pro- 
vided. 

502.9.5.5.2 Basements and pits. Class I liquids shall 
not be stored or used within a building having a base- 
ment or pit into which flammable vapors can travel, 
unless such area is provided with ventilation designed 
to prevent the accumulation of flammable vapors 
therein. 

502.9.5.5.3 Dispensing of Class I liquids. Contain- 
ers of Class I liquids shall not be drawn from or filled 
within buildings unless a provision is made to prevent 
the accumulation of flammable vapors in hazardous 
concentrations. Where mechanical ventilation is 
required, it shall be kept in operation while flammable 
vapors could be present. 

502.9.6 Highly toxic and toxic liquids. Ventilation exhaust 
shall be provided for highly toxic and toxic liquids as 
required by Sections 502.9.6.1 and 502.9.6.2. 

502.9.6.1 Treatment system. This provision shall apply 
to indoor and outdoor storage and use of highly toxic and 
toxic liquids in amounts exceeding the maximum allow- 
able quantities per control area. Exhaust scrubbers or 
other systems for processing yapors of highly toxic liquids 
shall be provided where a spill or accidental release of 
such liquids can be expected to release highly toxic vapors 
at normal temperature and pressure. 

502.9.6.2 Open and closed systems. Mechanical 
exhaust ventilation shall be provided for highly toxic and 
toxic liquids used in open systems in accordance with 
Section 502.8.4. Mechanical exhaust ventilation shall be 
provided for highly toxic and toxic liquids used in closed 
systems in accordance with Section 502.8.5. 

Exception; Liquids or solids that do not generate 
highly toxic or toxic fumes, mists or vapors. 

502.9.7 Highly, toxic and toxic compressed gases— any 
quantity. Ventilation exhaust shall be provided for highly 
toxic and toxic compressed gases in any quantity as required 
by Sections 502.9.7.1 and 502.9.7.2. 

502.9.7.1 Gas cabinets. Gas cabinets containing highly 
toxic or toxic compressed gases in any quantity shall- 



comply with Section 502.8.2 and the following require- 
ments: 

1. The average ventilation velocity at the face of gas 
cabinet access ports or windows shall be not less 
than 200 feet per minute (1.02 m/s) with a mini- 
mum velocity of 150 feet per minute (0.76 m/s) at 
any point at the access port or window. 

2. Gas cabinets shall be connected to an exhaust sys- 
tem. 

3. Gas cabinets shall not be used as the sole means of 
exhaust for any room or area. 

502.9.7.2 Exhausted enclosures. Exhausted enclosures 
containing highly toxic or toxic compressed gases in any 
quantity shall comply with Section 502.8.2 and the fol- 
lowing requirements: 

1. The average ventilation velocity at the face of the 
enclosure shall be not less than 200 feet per minute 
(1 .02 m/s) with a minimum velocity of 150 feet per 
minute (0.76 m/s). 

2. Exhausted enclosures shall be connected to an 
exhaust system. 

3. Exhausted enclosures shall not be used as the sole 
means of exhaust for any room or area. 

502.9.8 Highly toxic and toxic compressed gases^quan- 
tities exceeding the maximum allowable quantity per 
control area. Ventila.tion exhaust shall be provided for 
highly toxic and toxic compressed gases in amounts 
exceeding the maximum allowable quantities per control 
area as required by Sections 502.9.8.1 through 502.9.8.6. 

502.9.8.1 Ventilated areas. The room or area in which 
indoor gas cabinets or exhausted enclosures are located 
shall be provided with exhaust ventilation. Gas cabinets 
or exhausted enclosures shall not be used as the sole 
means of exhaust for any room or area. 

502.9.8.2 Local exhaust for portable tanks. A means 
of local exhaust shall be provided to capture leakage 
from indoor and outdoor portable tanks. The local 
exhaust shall consist of portable ducts or collection sys- 
tems designed to be applied to the site of a leak in a valve 
or fitting on the tank. The local exhaust system shall be 
located in a gas room. Exhaust shall be directed to a treat- 
ment system where required by the Fire Code. 

502.9.8.3 Piping and controls — stationary tanks. Fill- 
ing or dispensing connections on indoor stationary tanks 
shall be provided with a means of local exhaust. Such 
exhaust shall be designed to capture fumes and vapors. 
The exhaust shall be directed to a treatment system 
where required by the Fire Code. 

502.9.8.4 Gas rooms. The ventilation system for gas 
rooms shall be designed to operate at a negative pressure 
in relation to the surrounding area. The exhaust ventila- 
tion from gas rooms shall be directed to an exhaust sys- 
tem. 

502.9.8.5 Treatment system. The exhaust ventilation 
from gas cabinets, exhausted enclosures and gas rooms. 



2007 OREGON WIECHANICAL SPECBALTV CODE 



39 



EXHAUST SYSTEMS 



and local exhaust systems required in Sections 502.9.8.2 
and 502.9.8.3 shall be directed to a treatment system 
where required by the Fire Code. 

502,9.8.6 Process equipment. Effluent from indoor and 
outdoor process equipment containing highly toxic or 
toxic compressed gases which could be discharged to the 
atmosphere shall be processed through an exhaust scrub- 
ber or other processing system. Such systems shall be in 
accordance with the Fire Code. 

502.9.9 Ozone gas generators. Ozone cabinets and ozone 
gas-generator rooms for systems having a maximum 
ozone-generating capacity of one-half pound (0.23 kg) or 
more over a 24-hour period shall be mechanically ventilated 
at a rate of not less than six air changes per hour. For cabi- 
nets, the average velocity of ventilation at makeup air open- 
ings with cabinet doors closed shall be not less than 200 feet 
per minute (1.02 m/s). 

502.9.10 LP-gas distribution facilities, LP-gas distribu- 
tion facilities shall be ventilated in accordance with NFPA 
58. 

502.9.10.1 Portable container use. Above-grade under- 
floor spaces or basements in which portable LP-gas con- 
tainers are used or are stored awaiting use or re-sale shall 
be provided with an approved means of ventilation. 

Exception: Department of Transportation (DOT) 
specification cylinders with a maximum water capac- 
ity of 2.5 pounds (1 kg) for use in completely self-con- 
tained hand torches and similar applications. The 
quantity of LP-gas shall not exceed 20 pounds (9 kg). 

502.9.11 Silane gas. Exhausted enclosures and gas cabinets 
for the indoor storage of silane gas in amounts exceeding the 
maximum allowable quantities per control area shall com- 
ply with this section. 

1. Exhausted enclosures and gas cabinets shall be in 
accordance with Section 502.8.2. 

2. The velocity of ventilation across unwelded fittings 
and connections on the piping system shall not be less 
than 200 feet per minute (1.02 m/s). 

3. The average velocity at the face of the access ports or 
windows in the gas cabinet shall not be less than 200 
feet per minute ( 1 .02 m/s) with a minimum velocity of 
150 feet per minute (0.76 m/s) at any point at the 
access port or window. 

502.10 Hazardous production materials (HPM). Exhaust 
ventilation systems and materials for ducts utilized for the 
exhaust of HPM shall comply with this section, other applica- 
ble provisions of this code, the Building Code and the Fire 
Code. 

[F]502.10.1 Where required. Exhaust ventilation systems 
shall be provided in the following locations in accordance 
with the requirements of this section and the Building Code. 

1 . Fabrication areas: Exhaust ventilation for fabrica- 
tion areas shall comply with the Building Code. Addi- 
tional manual control switches shall be provided 
where required by the code official. 



2. Workstations: A ventilation system shall be pro- 
vided to capture and exhaust gases, fumes and vapors | 
at workstations. 

3. Liquid storage rooms: Exhaust ventilation for liquid 
storage rooms shall comply with Section 502.8.1.1 
and the Building Code. 

4. HPM rooms: Exhaust ventilation for HPM rooms 
shall comply with Section 502.8. 1.1 and the Building 
Code. 

5. Gas cabinets: Exhaust ventilation for gas cabinets 
shall comply with Section 502.8.2. The gas cabinet 
ventilation system is allowed to connect to a worksta- 
tion ventilation system. Exhaust ventilation for gas 
cabinets containing highly toxic or toxic gases shall 
also comply with Sections 502.9.7 and 502.9.8. 

6. Exhausted enclosures: Exhaust ventilation for 
exhausted enclosures shall comply with Section 
502.7.2. Exhaust ventilation for exhausted enclosures 
containing highly toxic or toxic gases shall also com- 
ply with Sections 502.9.7 and 502.9.8. 

7. Gas rooms: Exhaust ventilation for gas rooms shall 
comply with Section 502.8.2. Exhaust ventilation for 
gas cabinets containing highly toxic or toxic gases 
shall also comply with Sections 502.9.7 and 502.9.8. 

502.10.2 Penetrations. Exhaust ducts penetrating fire bar- 
rier assemblies shall be contained in a shaft of equivalent 
fire-resistive construction. Exhaust ducts shall not penetrate 
building separation walls. Fire dampers shall not be 
installed in exhaust ducts. 

502.10.3 Treatment systems. Treatment systems for highly 
toxic and toxic gases shall comply with the Fire Code. 

502.11 Motion picture projectors. Motion picture projectors 
shall be exhausted in accordance with Section 502.11.1 or 
502.11.2. 

502.11.1 Projectors with an exhaust discharge. Projec- 
tors equipped with an exhaust discharge shall be directly 
connected to a mechanical exhaust system. The exhaust sys- 
tem shall operate at an exhaust rate as indicated by the man- 
ufacturer's installation instructions. 

502.11.2 Projectors without exhaust connection. Projec- 
tors without an exhaust connection shall have contaminants 
exhausted through a mechanical exhaust system. The 
exhaust rate for electric arc projectors shall be a minimum of 
200 cubic feet per minute (cfm) (0.09 mVs) per lamp. The 
exhaust rate for xenon projectors shall be a minimum of 300 
cfm (0.14 mVs) per lamp. Xenon projector exhaust shall be 
at a rate such that the exterior temperature of the lamp hous- 
ing does not exceed 130°F (54°C). The lamp and projection 
room exhaust systems, whether combined or independent, 
shall not be interconnected with any other exhaust or return 
system within the building. 

502.12 Organic coating processes. Enclosed structures 
involving organic coating processes in which Class I liquids are 
processed or handled shall be ventilated at a rate of not less than 
1 cfm/ft2 [0.00508 mV{s ■ m^)] of solid floor area. Ventilation 
shall be accomplished by exhaust fans that intake at floor levels 



40 



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EXHAUST SYSTEMS 



and discharge to a safe location outside the structure. 
Noncontaminated intake air shall be introduced in such a man- 
ner that all portions of solid floor areas are provided with con- 
tinuous uniformly distributed air movement. 

502.13 Public garages. Mechanical exhaust systems for pub- 
lic garages, as required in Chapter 4, shall operate continuously 
or in accordance with Section 404. 

502.14 Motor vehicle operation. In areas where motor vehi- 
cles operate, mechanical ventilation shall be provided in accor- 
dance with Section 403. Additionally, areas in which stationary 
motor vehicles are operated shall be provided with a source 
capture system that connects directly to the motor vehicle 
exhaust systems. 

Exceptions: 

1 . This section shall not apply where the motor vehicles 
being operated or repaired are electrically powered. 

2. This section shall not apply to one- and two-family 
dwellings. 

3. This section shall not apply to motor vehicle service 
areas where engines are operated inside the building 
only for the duration necessary to move the motor 
vehicles in and out of the building. 

502.15 Repair garages. Where Class I liquids or LP-gas are 
stored or used within a building having a basement or pit 
wherein flammable vapors could accumulate, the basement or 
pit shall be provided with ventilation designed to prevent the 
accumulation of flammable vapors therein. 

502.16 Repair garages for natural gas- and hydro- 
gen-fueled vehicles. Repair garages used for the repair of natu- 
ral gas- or hydrogen-fueled vehicles shall be provided with an 
approved mechanical ventilation system. The mechanical ven- 
tilation system shall be in accordance with Sections 502.16.1 
and 502.16.2. 

Exception: Where approved by the code official, natural 
ventilation shall be permitted in lieu of mechanical ventila- 
tion. 

502.16.1 Design. Indoor locations shall be ventilated utiliz- 
ing air supply inlets and exhaust outlets arranged to provide 
uniform air movement to the extent practical. Inlets shall be 
uniformly arranged on exterior walls near floor level. Out- 
lets shall be located at the high point of the room in exterior 
walls or the roof. 

Ventilation shall be by a continuous mechanical ventila- 
tion system or by a mechanical ventilation system activated 
by a continuously monitoring natural gas detection system, 
or for hydrogen, a continuously monitoring flammable gas 
detection system, each activating at a gas concentration of 
25 percent of the lower flammable limit (LFL). In all cases, 
the system shall shut down the fueling system in the event of 
failure of the ventilation system. 

The ventilation rate shall be at least 1 cubic foot per min- 
ute per 12 cubic feet [0.00138 m¥(s • m^)] of room volume. 



502.16.2 Operation. The mechanical ventilation system 
shall operate continuously. 

Exceptions: 

1. Mechanical ventilation systems that are inter- 
locked with a gas detection system designed in 
accordance with the Fire Code. 

2. Mechanical ventilation systems in garages that are 
used only for the repair of vehicles fueled by liquid 
fuels or odorized gases, such as CNG, where the 
ventilation system is electrically interlocked with 
the lighting circuit. 

502.17 Tire rebuilding or recapping. Each room where rub- 
ber cement is used or mixed, or where flammable or combusti- 
ble solvents are applied, shall be ventilated in accordance with 
the applicable provisions of NFPA 9 1 . 

502.17.1 Buffing machines. Each buffing machine shall be 
connected to a dust-collecting system that prevents the 
accumulation of the dust produced by the buffing process. 

502.18 Specific rooms. Specific rooms, including bathrooms, 
locker rooms, smoking lounges and toilet rooms, shall be 
exhausted in accordance with the ventilation requirements of 
Chapter 4. 

502.19 Indoor firing ranges. Ventilation shall be provided in 
an approved manner in areas utilized as indoor firing ranges. 



SECTION 503 
MOTORS AND FANS 

503.1 General. Motors and fans shall be sized to provide the 
required air movement. Motors in areas that contain flammable 
vapors or dusts shall be of a type approved for such environ- 
ments. A manually operated remote control installed at an 
approved location shall be provided to shut off fans or blowers 
in flammable vapor or dust systems. Electrical equipment and 
appliances used in operations that generate explosive or flam- 
mable vapors, fumes or dusts shall be interlocked with the ven- 
tilation system so that the equipment and appliances cannot be 
operated unless the ventilation fans are in operation. Motors for 
fans used to convey flammable vapors or dusts shall be located 
outside the duct or shall be protected with approved shields and 
dustproofmg. Motors and fans shall be provided with a means 
of access for servicing and maintenance. 

503.2 Fans. Parts of fans in contact with explosive or flamma- 
ble vapors, fumes or dusts shall be of nonferrous or 
nonsparking materials, or their casing shall be lined or con- 
structed of such material. When the size and hardness of mate- 
rials passing through a fan are capable of producing a spark, 
both the fan and the casing shall be of nonsparking materials. 
When fans are required to be spark resistant, their bearings 
shall not be within the airstream, and all parts of the fan shall be 
grounded. Fans in systems-handling materials that are capable 
of clogging the blades, and fans in buffimg or woodworking 
exhaust systems, shall be of the radial-blade or tube-axial type. 

503.3 Equipment and appliances identification plate. 

Equipment and appliances used to exhaust explosive or flam- 



< 



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41 



EXHAUST SYSTEMS 



> 



mable vapors, fumes or dusts shall bear an identification plate 
stating the ventilation rate for which the system was designed. 

503.4 Corrosion=resistant fans. Fans located in systems con- 
veying corrosives shall be of materials that are resistant to the 
corrosive or shall be coated with corrosion-resistant materials. 



SECTION 504 
CLOTHES DRYER EXHAUST 

504.1 Installation. Clothes dryers shall be exhausted in accor- 
dance with the manufacturer's instructions. Dryer exhaust sys- 
tems shall be independent of all other systems and shall convey 
the moisture and any products of combustion to the outside of 
the building. 

Exception: This section shall not apply to listed and labeled 
condensing (ductless) clothes dryers. 

504.2 Exhaust penetrations. Ducts that exhaust clothes dry- 
ers shall not penetrate or be located within any fireblocking, 
draftstopping or any wall, floor/ceiling or other assembly 
required by the Building Code to be fire-resistance rated, 
unless such duct is constructed of galvanized steel or aluminum 
of the thickness specified in Section 603.4 and the fire-resis- 
tance rating is maintained in accordance with the Building 
Code. Fire dampers, combination fire/smoke dampers and any 
similar devices that will obstruct the exhaust flow, shall be pro- 
hibited in clothes dryer exhaust ducts. 

504.3 Cleanout. Each vertical riser shall be provided with a 
means for cleanout. 

504.4 Exhaest installation. Dryer exhaust ducts for clothes 
dryers shall terminate on the outside of the building and shall 
be equipped with a backdraft damper. Screens shall not be 
installed at the duct termination. Ducts shall not be connected 
or installed with sheet metal screws or other fasteners that will 
obstruct the exhaust flow. Clothes dryer exhaust ducts shall not 
be connected to a vent connector, vent or chimney. Clothes 
dryer exhaust ducts shall not extend into or through ducts or 
plenums. 

504.5 Makeup air. Installafions exhausting more than 200 cfm 
(0.09 m^/s) shall be provided with makeup air. Where a closet is 
designed for the installation of a clothes dryer, an opening hav- 
ing an area of not less than 100 square inches (0.0645 m^) shall 
be provided in the closet enclosure. 

504.6 Domestic clothes dryer ducts. Exhaust ducts for 
domestic clothes dryers shall be constructed of metal and shall 
have a smooth interior finish. The exhaust duct shall be a mini- 
mum nominal size of 4 inches (102 mm) in diameter. The entire 
exhaust system shall be supported and secured in place. The 
male end of the duct at overlapped duct joints shall extend in 
the direction of airflow. Clothes dryer transition ducts used to 
connect the appliance to the exhaust duct system shall be lim- 
ited to single lengths not to exceed 8 feet (2438 mm). Transi- 
tion ducts shall not be concealed within construction. 

504.6.1 Maximum length. The maximum length of a 
clothes dryer exhaust duct shall not exceed 25 feet (7620 
mm) from the dryer location to the outlet terminal. The 
maximum length of the duct shall be reduced 2V2 feet (762 
mm) for each 45 degree (0.79 rad) bend and 5 feet (1524 



mm) for each 90 degree (1.6 rad) bend. The maximum 
length of the exhaust duct does not include the transition 
duct. 

Exception: Where the make and model of the clothes 
diyer to be installed is known and the manufacturer's 
installation instructions for such dryer are provided to the 
code official, the maximum length of the exhaust duct, 
including any transition duct, shall be permitted to be in 
accordance with the dryer manufacturer's installation 
instructions. 



504.6.2 Rough-in required. Where a compartment or 
space for a domestic clothes dryer is provided, an exhaust 
duct system shall be installed in accordance with Sections 
504.6 and 504.6.1. 

504.7 Commercial clothes dryers. The installation of dryer 
exhaust ducts serving Type 2 clothes dryers shall comply with 
the appliance manufacturer's installation instructions. Exhaust 
fan motors installed in exhaust systems shall be located outside 
of the airstream. In multiple installations, the fan shall operate 
continuously or be interlocked to operate when any individual 
unit is operating. Ducts shall have a minimum clearance of 6 
inches (152 mm) to combustible materials. Clothes dryer tran- 
sition ducts used to connect the appliance to the exhaust duct 
system shall be limited to single lengths not to exceed 8 feet 
(2438 mm) in length and shall be listed and labeled for the 
application. Transition ducts shall not be concealed within con- 
struction. 



SECT80N 505 
DOMESTIC KITCHEN EXHAUST EQ8 



iEi 



505.1 Domestic systems. Where domestic range hoods and 
domestic appliances equipped with downdraft exhaust are 
located within dwelling units, such hoods and appliances shall 
discharge to the outdoors through sheet metal ducts con- 
structed of galvanized steel, stainless steel, aluminum or cop- 
per. Such ducts shall have smooth inner walls and shall be air 
tight and equipped with a backdraft damper. 

Exceptions: 

1. Where installed in accordance with the manufac- 
turer's installation instructions and where mechanical 
or natural ventilation is otherwise provided in accor- 
dance with Chapter 4, listed and labeled ductless 
range hoods shall not be required to discharge to the 
outdoors. 

2. Ducts for domestic kitchen cooking appliances 
equipped with downdraft exhaust systems shall be 
permitted to be constructed of Schedule 40 PVC pipe 
provided that the installation complies with all of the 
following: 

2. 1 . The duct shall be installed under a concrete slab 
poured on grade. 

2.2. The underfloor trench in which the duct is 
installed shall be completely backfilled with 
sand or gravel. 



42 



2007 OREGON MECHANICAL SPECIALTY CODE 



EXHAUST SYSTEMS 




2.3. The PVC duct shall extend not greater than 1 
inch (25 mm) above the indoor concrete floor 
surface. 

2.4. The PVC duct shall extend not greater than 1 
inch (25 mm) above grade outside of the build- 
ing. 

2.5. The PVC ducts shall be solvent cemented. 



SECTION 506 
COMMERCIAL KITCHEN HOOD VENTILATION 
SYSTEM DUCTS AND EXHAUST EQUIPMENT 

506.1 GeneraL Commercial kitchen hood ventilation ducts 
and exhaust equipment shall comply with the requirements of 
this section. Commercial kitchen grease ducts shall be 
designed for the type of cooking appliance and hood served. 

506.2 Corrosion protection. Ducts exposed to the outside 
atmosphere or subject to a corrosive environment shall be pro- 
tected against corrosion in an approved manner. 

506.3 Ducts serving Type I hoods. Type I exhaust ducts shall 
be independent of all other exhaust systems except as provided 
in Section 506.3.5. Commercial kitchen duct systems serving 
Type I hoods shall be designed, constructed and installed in 
accordance with Sections 506.3.1 through 506.3.12.3. 

506.3.1 Duct materials. Ducts serving Type I hoods shall 
be constructed of materials in accordance with Sections 
506.3.1.1 and 506.3. 1.2. 

506.3.1.1 Grease duct materials. Grease ducts serving 
Type I hoods shall be constructed of steel not less than 
0.055 inch (1.4 mm) (No. 16 Gage) in thickness or stain- 
less steel not less than 0.044 inch (1.1 mm) (No. 18 
Gage) in thickness. 

Exception: Listed and labeled factory-built commer- 
cial kitchen grease ducts shall be installed in accor- 
dance with Section 304.1. 

506.3.1.2 Makeup air ducts. Make up air ducts connect- 
ing to or within 1 8 inches (457 mm) of a Type I hood shall 
be constructed and installed in accordance with Sections 
603.1, 603.3, 603.4, 603.9, 603.10 and 603.12. Duct 
insulation installed within 18 inches (457 mm) of a Type 
I hood shall be noncombustible or shall be listed for the 
application. 

506.3.2 Joints, seams and penetrations of grease ducts. 

Joints, seams and penetrations of grease ducts shall be made 
with a continuous liquid-tight weld or braze made on the 
external surface of the duct system. 

Exceptions: 

1 . Penetrations shall not be required to be welded or 
brazed where sealed by devices that are listed for 
the application. 

2. Internal welding or brazing shall not be prohibited 
provided that the joint is formed or ground smooth 
and is provided with ready access for inspection. 



3. Factory-built commercial kitchen grease ducts 
listed and labeled in accordance with UL 1978 and 
installed in accordance with Section 304.1. 

506.3.2.1 Duct joint types. Duct joints shall be butt 
joints or overlapping duct joints of either the telescoping 
or bell type. Overlapping joints shall be installed to pre- 
vent ledges and obstructions from collecting grease or 
interfering with gravity drainage to the intended collec- 
tion point. The difference between the inside cross-sec- 
tional dimensions of overlapping sections of duct shall 
not exceed 0.25 inch (6 mm). The length of overlap for 
overlapping duct joints shall not exceed 2 inches (5 1 
mm). 

506.3.2.2 Duct-to-hood joints. Duct-to-hood joints 
shall be made with continuous internal or external liq- 
uid-tight welded or brazed joints. Such joints shall be 
smooth, accessible for inspection, and without grease 
traps. 

Exceptions: This section shall not apply to: 

1 . A vertical duct-to-hood collar connection made 
in the top plane of the hood in accordance with 
all of the following: 

1.1. The hood duct opening shall have a 
1 -inch-deep (25 mm), full perimeter, 
welded flange turned down into the hood 
interior at an angle of 90 degrees from the 
plane of the opening. 

1 .2. The duct shall have a 1 -inch-deep (25 mm) 
flange made by a 1-inch by 1-inch (25 mm 
by 25 mm) angle iron welded to the full 
perimeter of the duct not less than 1 inch 
(25 mm) above the bottom end of the duct. 

1.3. A gasket rated for use at not less than 
1,500°F (815°C) is installed between the 
duct flange and the top of the hood. 

1.4. The duct-to-hood joint shall be secured by 
stud bolts not less than 0.25 inch (6.4 mm) 
in diameter welded to the hood with a spac- 
ing not greater than 4 inches (102 mm) on 
center for the full perimeter of the opening. 
All bolts and nuts are to be secured with 
lockwashers. 

2. Listed and labeled duct-to-hood collar connec- 
tions installed in accordance with Section 
304.1. 

506.3.2.3 Duct-to-exhaust fan connections. Duct- 
to-exhaust fan connections shall be flanged and gasketed 
at the base of the fan for vertical discharge fans; shall be 
flanged, gasketed and bolted to the inlet of the fan for 
side-inlet utility fans; and shall be flanged, gasketed and 
bolted to the inlet and outlet of the fan for in-line fans. 

506.3.2.4 Vibration isolation. A vibration isolation 
connector for connecting a duct to a fan shall consist of 
noncombustible packing in a metal sleeve joint of 
approved design or shall be a coated-fabric flexible duct 
connector Hsted and labeled for the application. Vibra- 



2007 OREGON MECHANICAL SPECIALTY CODE 



43 



EXHAUST SYSTEMS 



> 



tion isolation connectors shall be installed only at the 
connection of a duct to a fan inlet or outlet. 

506.3.3 Grease duct supports. Grease duct bracing and 
supports shall be of noncombustible material securely 
attached to the structure and designed to carry gravity and 
seismic loads within the stress limitations of the Building 
Code. Bolts, screws, rivets and other mechanical fasteners 
shall not penetrate duct walls. 

506.3.4 Air velocity. Grease duct systems serving a Type I 
hood shall be designed and installed to provide an air veloc- 
ity within the duct system of not less than 500 feet per min- 
ute (2.5 m/s). 

Exception: The velocity limitations shall not apply 
within duct transitions utilized to connect ducts to differ- 
ently sized or shaped openings in hoods and fans, pro- 
vided that such transitions do not exceed 3 feet (914 mm) 
in length and are designed to prevent the trapping of 
grease. 

506.3.5 Separation of grease duct system. A separate 
grease duct system shall be provided for each Type I hood. 
A separate grease duct system is not required where all of 
the following conditions are met: 

1 . All interconnected hoods are located within the same 
story. 

2. All interconnected hoods are located within the same 
room or in adjoining rooms. 

3. Interconnecting ducts do not penetrate assemblies 
required to be fire-resistance rated. 

4. The grease duct system does not serve solid fuel-fired 
appliances. 

506.3.6 Grease duct clearances. Grease duct systems and 
exhaust equipment serving a Type I hood shall have a clear- 
ance to combustible construction of not less than 1 8 inches 
(457 mm), and shall have a clearance to noncombustible 
construction and gypsum wallboard attached to 
noncombustible structures of not less than 3 inches (76 
mm). 

Exception: Listed and labeled factory-built commercial 
kitchen grease ducts and exhaust equipment installed in 
accordance with Section 304. 1 . 

506.3.7 Prevention of grease accumulation in grease 

ducts. Duct systems serving a Type I hood shall be con- 
structed and installed so that grease cannot collect in any 
portion thereof, and the system shall slope not less than 
one-fourth unit vertical in 12 units horizontal (2-percent 
slope) toward the hood or toward an approved grease reser- 
voir. Where horizontal ducts exceed 75 feet (22 860 mm) in 
length, the slope shall not be less than one unit vertical in 12 
units horizontal (8.3-percent slope). 

506.3.7.1 Grease diverter. Where a centrifugal fan with 
horizontal discharge is located outside the building, such 
fan shall be provided with a duct or duct fitting connected 



to the fan outlet that diverts the discharge from the grease 
exhaust duct system in an upward direction. Such 
diverter duct or fitting shall comply with the following: 

1. The duct or duct fitting shall be constructed of 
metal as set forth in Chapter 6. 

2. The maximum total developed length of the duct 
or duct fitting measured along the centerline shall 
not exceed three times the vertical dimension of 
the fan outlet. 

3. The duct or duct fitting shall be provided with 
openings at the lowest point to permit drainage of 
grease to an approved collection device. 

506.3.8 Grease duct cleanouts and other openings. 

Grease duct systems shall not have openings therein other 
than those required for proper operation and maintenance of 
the system. Any portion of such system having sections not 
provided with access from the duct entry or dischcU"ge shall 
be provided with cleanout openings. Cleanout openings 
shall be equipped with tight-fitting doors constructed of 
steel having a thickness not less than that required for the 
duct. Doors shall be equipped with a substantial method of 
latching, sufficient to hold the door tightly closed. Doors 
shall be designed so that they are operable without the use of 
a tool. Door assemblies, including any frames and 
gasketing, shall be approved for the purpose, and shall not 
have fasteners that penetrate the duct. Listed and labeled 
access door assemblies shall be installed in accordance with 
the terms of the listing. 

506.3.8.1 Personnel entry. Where ductwork is large 
enough to allow entry of personnel, not less than one 
approved or listed opening having dimensions not less 
thfin 20 inches by 20 inches (508 mm by 508 mm) shall 
be provided in the horizontal sections, and in the top of 
vertical risers. Where such entry is provided, the duct and 
its supports shall be capable of supporting the additional 
load and the cleanouts specified in Section 506.3.8 are 
not required. 

506.3.9 Grease duct horizontal cleanouts. Cleanouts 
located on horizontal sections of ducts shall be spaced not 
more than 20 feet (6096 mm) apart. The cleanouts shall be 
located on the side of the duct with the opening not less than 
1.5 inches (38 mm) above the bottom of the duct, and not 
less than 1 inch (25 mm) below the top of the duct. The 
opening minimum dimensions shall be 12 inches (305 mm) 
on each side. Where the dimensions of the side of the duct 
prohibit the cleanout installation prescribed herein, the 
openings shall be on the top of the duct or the bottom of the 
duct. Where located on the top of the duct, the opening 
edges shall be a minimum of 1 inch (25 mm) from the edges 
of the duct. Where located in the bottom of the duct, 
cleanout openings shall be designed to provide internal 
damming around the opening, shall be provided with 
gasketing to preclude grease leakage, shall provide for 
drainage of grease down the duct around the dam, and shall 
be approved for the application. Where the dimensions of 



2007 OREGON MECHANICAL SPECIALTY CODE 



EXHAUST SYSTEMS 




the sides, top or bottom of the duct preclude the installation 
of the prescribed minimum- size cleanout opening, the 
cleanout shall be located on the duct face that affords the 
largest opening dimension and shall be installed with the 
opening edges at the prescribed distances from the duct 
edges as previously set forth in this section. 

506.3.10 Grease duct enclosure. A grease duct serving a 
Type I hood that penetrates a ceiling, wall or floor shall be 
enclosed from the point of penetration to the outlet terminal. 
A duct shall penetrate exterior walls only at locations where 
unprotected openings are permitted by the Building Code. 
Ducts shall be enclosed in accordance with the Building 
Code requirements for shaft construction. The duct enclo- 
sure shall be sealed around the duct at the point of penetra- 
tion and vented to the outside of the building through the use 
of weather-protected openings. Clearance from the duct to 
the interior surface of enclosures of combustible construc- 
tion shall be not less than 18 inches (457 mm). Clearance 
from the duct to the interior surface of enclosures of 
noncombustible construction or gypsum wall board 
attached to noncombustible structures shall be not less than 
6 inches (152 mm). The duct enclosure shall serve a single 
grease exhaust duct system and shall not contain any other 
ducts, piping, wiring or systems. 

Exceptions: 

1 . The shaft enclosure provisions of this section shall 
not be required where a duct penetration is pro- 
tected with a through-penetration firestop system 
classified in accordance with ASTM E 814 and 
having an "F" and "T" rating equal to the fire-resis- 
tance rating of the assembly being penetrated and 
where the surface of the duct is continuously cov- 
ered on all sides from the point at which the duct 
penetrates a ceiling, wall or floor to the outlet ter- 
minal with a classified and labeled material, sys- 
tem, method of construction or product 
specifically evaluated for such purpose, in accor- 
dance with ASTM E 2336. Exposed ductwrap sys- 
tems shall be protected where subject to physical 
damage. 

2. The shaft enclosure provisions of this section 
shall not be required where a duct penetration is 
protected with a through-penetration firestop sys- 
tem classified in accordance with ASTM E 814 
and having an "F" and "T" rating equal to the fire 
resistance rating of the assembly being penetrated 
and where a prefabricated grease duct enclosure 
assembly is protected on all sides from the point 
at which the duct penetrates a ceiling, wall or 
floor to the outlet terminal with a classified and 
labeled prefabricated system specifically evalu- 
ated for such purposes in accordance with UL 
2221. 



3. A duct enclosure shall not be required for a grease 
duct that penetrates only a nonfire-resistance-rated 
roof/ceiling assembly. 

506.3.11 Grease duct fire-resistive access opening. 

Where cleanout openings are located in ducts within a 
fire-resistance-rated enclosure, access openings shall be 
provided in the enclosure at each cleanout point. Access 
openings shall be equipped with tight-fitting sliding or 
hinged doors that are equal in fire-resistive protection to that 
of the shaft or enclosure. An approved sign shall be placed 
on access opening panels with wording as follows: 
'ACCESS PANEL. DO NOT OBSTRUCT." 

506.3.12 Exhaust outlets serving Type I hoods. Exhaust 
outlets for grease ducts serving Type I hoods shall conform 
to the requirements of Sections 506.3.12.1 through 
506.3.12.3. 

506.3.12.1 Termination above the roof. Exhaust out- 
lets that terminate above the roof shall have the discharge 
opening located not less than 40 inches (1016 mm) above 
the roof surface. 

506.3.12.2 Termination through an exterior wall. 

Exhaust outlets shall be permitted to terminate through 
exterior walls where the smoke, grease, gases, vapors, 
and odors in the discharge from such terminations do not 
create a public nuisance or a fire hazard. Such termina- 
tions shall not be located where protected openings are 
required by the Building Code. Other exterior openings 
shall not be located within 3 feet (914 mm) of such termi- 
nations. 

506.3.12.3 Termination location. Exhaust outlets 
shall be located not less than 10 feet (3048 mm) hori- 
zontally from parts of the same or contiguous buildings, 
adjacent buildings, adjacent property lines and air 
intake openings into any building and shall be located 
not less than 10 feet (3048 mm) above the adjoining 
grade level. 

Exception: Exhaust outlets shall terminate not less 
than 5 feet (1524 mm) from parts of the same or con- 
tiguous building, an adjacent building, adjacent prop- 
erty line and air intake openings into a building where 
air from the exhaust outlet discharges away from such 
locations. 

506.4 Ducts serving Type II hoods. Single or combined Type 
II exhaust systems for food-processing operations shall be 
independent of all other exhaust systems. Commercial kitchen 
exhaust systems serving Type II hoods shall comply with Sec- 
tions 506.4.1 and 506.4.2. 

506.4.1 Type II exhaust outlets. Exhaust outlets for ducts 
serving Type II hoods shall comply with Sections 401 .4 and 
401.4.2. Such outlets shall be protected against local 
weather conditions and shall meet the provisions for exte- 
rior wall opening protectives in accordance with the Build- 
ing Code. 



2007 OREGON MECHANICAL SPECIALTY CODE 



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EXHAUST SYSTEMS 



506,4.2 Ducts. Ducts and plenums serving Type II hoods 
shall be constructed of rigid metallic materials. Duct con- 
struction, installation, bracing and supports shall comply 
with Chapter 6. Ducts subject to positive pressure and ducts 
conveying moisture-laden or waste-heat-laden air shall be 
constructed, joined and sealed in an approved manner. 



Exhaust equipment, including 
fans and grease reservoirs, shall comply with Sections 506.5.1 
through 506.5.5 and shall be of an approved design or shall be 
listed for the application. 

506.5.1 Exhaust fans. Exhaust fan housings serving a Type 
I hood shall be constructed as required for grease ducts in 
accordance with Section 506.3.1.1. 

Exception; Fans listed and labeled in accordance with 
UL 762. 

506.5.1.1 Fan motor. Exhaust fan motors shall be 
located outside of the exhaust airstream. 

506.5.2 Exhaust fam discharge. Exhaust fans shall be 
positioned so that the discharge will not impinge on the 
roof, other equipment or appliances or parts of the struc- 
ture. A vertical discharge fan shall be manufactured with 
an approved drain outlet at the lowest point of the housing 
to permit drainage of grease to an approved grease reser- 
voir. 

506.5.3 Exhaust fan mounting. An upblast fan shall be 
hinged and supplied with a flexible weatherproof electrical 
cable to permit inspection and cleaning. The ductwork shall 
extend a minimum of 18 inches (457 mm) above the roof 
surface. 

506.5.4 Clearances. Exhaust equipment serving a Type I 
hood shall have a clearance to combustible construction of 
not less than 18 inches (457 mm). 

Exceptioim: Factory-built exhaust equipment installed in 
accordance with Section 304.1 and listed for a lesser 
clearance. 

506.5.5 Termination location. The outlet of exhaust equip- 
ment serving Type I hoods shall be in accordance with Sec- 
tion 506.3.12. 

Exception: The minimum horizontal distance between 
vertical discharge fans and parapet-type building struc- 
tures shall be 2 feet (610 mm) provided that such struc- 
tures are not higher than the top of the fan discharge 
opening. 



SECTDON 507 
COiVIMERClAL KITCHEN HOODS 

507.1 General. Commercial kitchen exhaust hoods shall com- 
ply with the requirements of this section. Hoods shall be Type I 
or Type II and shall be designed to capture and confine cooking 
vapors and residues. Commercial kitchen exhaust hood sys- 
tems shall operate during the cooking operation. 



Exceptions: 

1. Factory-built commercial exhaust hoods which are 
tested in accordance with UL 710, listed, labeled and 
installed in accordance with Section 304.1 shall not 
be required to comply with Sections 507.4, 507.7, 
507.11, 507.12, 507.13, 507.14 and 507.15. 

2. Factory-built commercial cooking recirculating sys- 
tems which are tested in accordance with UL 710B, 
listed, labeled and installed in accordance with Sec- 
tion 304.1 shall not be required to comply with Sec- 
tions 507.4, 507.5, 507.7, 507.12, 507.13, 507.14 and 
507.15. 

3. Net exhaust volumes for hoods shall be permitted to 
be reduced during no-load cooking conditions, where 
engineered or listed multispeed or variable-speed 
controls automatically operate the exhaust system to 
maintain capture and removal of cooking effluents as 
required by this section. 

507.2 Where required. A Type I or Type II hood shall be 
installed at or above all commercial cooking appliances in 
accordance with Sections 507.2.1 and 507.2.2. Where any 
cooking appliance under a single hood requires a Type I hood, a 
Type I hood shall be installed. Where a Type II hood is 
required, a Type I or Type II hood shall be installed. 

507.2.1 Type I hoods. Type I hoods shall be installed where 
cooking appliances produce grease or smoke, such as occurs 
with griddles, fryers, broilers, ovens, ranges and wok ranges. 

507.2.2 Type II hoods. Type II hoods shall be installed 
where cooking or dishwashing appliances produce heat, 
steam, or products of combustion and do not produce grease 
or smoke, such as steamers, kettles, pasta cookers and 
dishwashing machines. 

Exceptions: 

1. Under-counter-type commercial dishwashing 
machines. 

2. A Type 11 hood is not required for di shwashers and 
potwashers that are provided with heat and water 
vapor exhaust systems that are supplied by the 
appliance manufacturer and are installed in accor- 
dance with the manufacturer's instructions. 

3. A single light-duty electric convection, bread, 
retherm or microwave oven. The additional heat 
and moisture loads generated by such appliances 
shall be accounted for in the design of the HVAC 

system. 

4. A Type II hood is not required for the following 
electrically heated appliances: toasters, steam 
tables, popcorn poppers, hot dog cookers, coffee 
makers, rice cookers, egg cookers, holding/warm- 
ing ovens. The additional heat and moisture loads 
generated by such appliances shall be accounted 
for in the design of the HVAC system. 



< 



46 



2007 OREGON MECHANICAL SPECIALTY CODE 



EXHAUST SYSTEMS 



507.2.3 Domestic cooking appliances used for commer- 
cial purposes. Domestic cooking appliances utilized for 
commercial purposes shall be provided with Type I or Type 
II hoods as required for the type of appliances and processes 
in accordance with Sections 507.2, 507.2.1 and 507.2.2. 

507.2.4 Extra-heavy-duty. Type I hoods for use over 
extra-heavy-duty cooking appliances shall not cover other 
appliances that require fire extinguishing equipment and 
such hoods shall discharge to aniexhaust system that is inde- 
pendent of other exhaust systems. 

507.3 Fuel-burning appliances.. Where vented fuel-burning 
appliances are located in the same room or space as the hood, 
provisions shall be made to prevent the hood system from inter- 
fering with normal operation of the appliance vents. 

507.4 Type I materials. Type I hoods shall be constructed of 
steel not less than 0.043 inch (1.09 mm) (No. 1 8 MSG) in thick- 
ness, or stainless steel not less than 0.037 inch (0.94 mm) (No. 
20 MSG) in thickness. 

507.5 l^pe II hood materials. Type II hoods shall be con- 
structed of steelnot less than 0.030 inch (0.76 mm) (No. 22 
Gage) in thickness, stainless steel not less than 0.024 inch (0.61 
mm) (No. 24 Gage) in thickness, copper sheets weighing not 
less than 24 ounces per square foot (7.3 kg/m^), or of other 
approved material and gage. 

507.6 Supports. Type I hoods shall be secured in place by non- 
combustible supports. All Type I and Type II hood supports 
shall be adequate for the applied load of the hood, the unsup- 
ported ductwork, the effluent loading, and the possible weight 
of personnel working in or on the hood. 

507.7 Hood joints, seams and penetrations. Hood joints, 
seams and penetrations shall comply with Sections 507.7.1 and 
507.7.2. 

507.7.1 Type I hoods. External hood joints, seams and pen- 
etrations for Type I hoods shall be made with a continuous 
external liquid-tight weld or braze to the lowest outermost 
perimeter of the hood. Internal hood joints, seams, penetra- 
tions, filter support frames, and other appendages attached 
inside the hood shall not be required to be welded or brazed 
but shall be otherwise sealed to be grease tight. 

Exceptions: 

1 . Penetrations shall not be required to be welded or 
brazed where sealed by devices that are listed for 
the application. 

2. Internal welding or brazing of seams, joints, and 
penetrations of the hood shall not be prohibited 
provided that the joint is formed smooth or ground 
so as to not trap grease, and is readily cleanable. 

507.7.2 Type 11 hoods. Joints, seams and penetrations for 
Type II hoods shall be constructed as set forth in Chapter 6, 
shall be sealed on the interior of the hood and shall provide a 
smooth surface that is readily cleanable and water tight. 

507.8 Cleaning and grease gutters. A hood shall be designed 
to provide for thorough cleaning of the entire hood. Grease gut- 
ters shall drain to an approved collection receptacle that is fab- 
ricated, designed and installed to allow access for cleaning. 



507.9 Clearances for Type I hood. A Type I hood shall be 
installed with a clearance to combustibles of not less than 18 
inches (457 mm). This clearance may be reduced to 3 inches 
(76 mm), provided the combustible material is protected with 
materials as specified for 1-hour fire-resistive construction on 
the hood side. Hoods less than 12 inches (305 mm) from the 
ceiling or wall shall be flashed solidly with materials of the 
thickness specified in Section 507.4 or materials conforming to 
1-hour fire-resistive construction. 

507.10 Hoods penetrating a ceiling. Type I hoods or portions 
thereof penetrating a ceiling, wall or furred space shall comply 
with all the requirements of Section 506.3. 10. 

507.11 Grease filters. Type I hoods shall be equipped with 
listed grease filters designed for the specific purpose. 
Grease-collecting equipment shall be provided with access for 
cleaning. The lowest edge of a grease filter located above the 
cooking surface shall be not less than the height specified in 
Table 507.11. 

TABLE 507.11 

MINIMUM DISTANCE BETWEEN THE LOWEST EDGE OF A 

GREASE FILTER AND THE COOKING SURFACE OR THE 

HEATING SURFACE 



TYPE OF COOKING 
APPLIANCES 


HEIGHT ABOVE COOKING 
SURFACE (feet) 


Without exposed flame 


0.5 


Exposed fliame and burners 


2 


Exposed charcoal and charbroil type 


3.5 



For SI: 1 foot = 304.8 mm. 

507.11.1 Criteria. Filters shall be of such size, type and 
arrangement as will permit the required quantity of air to 
pass through such units at rates not exceeding those for 
which the filter or unit was designed or approved. Filter 
units shall be installed in frames or holders so as to be 
readily removable without the use of separate tools, unless 
designed and installed to be cleaned in place and the system 
is equipped for such cleaning in place. Removable filter 
units shall be of a size that will allow them to be cleaned in a 
dishwashing machine or pot sink. Filter units shall be 
arranged in place or provided with drip-intercepting devices 
to prevent grease or other condensate from dripping into 
food or on food preparation surfaces. 

507.11.2 Mounting position. Filters shall be installed at an 
angle of not less than 45 degrees (0.79 rad) from the hori- 
zontal and shall be equipped with a drip tray beneath the 
lower edge of the filters. 

507.12 Canopy size and location. The inside lower edge of 
canopy-type Type I and II commercial hoods shall overhang or 
extend a horizontal distance of not less than 6 inches (152 mm) 
beyond the edge of the top horizontal surface of the appliance 
on all open sides. The vertical distance between the front lower 
lip of the hood and such surface shall not exceed 4 feet (1219 
mm). 

Exception: The hood shall be permitted to be flush with the 
outer edge of the cooking surface where the hood is closed 
to the appliance side by a noncombustible wall or panel. 



< 



2007 OREGON MECHANICAL SPECIALTY CODE 



47 



EXHAUST SYSTEMS 



507.13 Capacity off Iioods. Commercial food service hoods 
shall exhaust a minimum net quantity of air determined in 
accordance with this section and Sections 507.13.1 through 
507. 1 3.4. The net quantity of exhaust air shall be calculated by 
subtracting any airflow supplied directly to a hood cavity from 
the total exhaust flow rate of a hood. Where any combination of 
heavy-duty, medium-duty and hght-duty cooking appliances 
are utilized under a single hood, the exhaust rate required by 
this section for the heaviest duty appliance covered by the hood 
shall be used for the entire hood. 

507.13«1 Extra-heavy-duty cooking appliaeces. The min- 
imum net airflow for Type I hoods used for heavy-duty 
cooking appliances shall be determined as follows: 



Type of Hood ^^ 

Backshelf/pass-over 
Double island canopy (per side) 
Eyebrow 

Single island canopy 
Wall-mounted canopy 



CFM per linear foot of hood 

Not allowed 

550 
Not allowed 

700 

550 



For SI: 1 cfm per linear foot = 1.55 L/s per linear meter 

507.13.2 Meavy-duty cooking appliances. The minimum 
net airflow for Type I hoods used for heavy-duty cooking 
appliances shall be determined as follows: 



Type of Hood 


CFM per linear foot of hood 


Backshelf/pass-over 


400 


Double island canopy (per side) 


400 


Eyebrow 


Not allowed 


Single island canopy 


600 


Wall-mounted canopy 


400 



For SI: 1 cfm per linear foot = 1.55 L/s per linear meter 

507.13.3 Medium-duty cooking appliances. The mini- 
mum net airflow for Type I hoods used for medium-duty 
cooking appliances shall be determined as follows: 



Type of Hood 


CFM per linear foot of hood 


Backshelf/pass-over 


300 


Double island canopy (per side) 


300 


Eyebrow 


250 


Single island canopy 


500 


Wall-mounted canopy 


300 



For SI: 1 cfm per linear foot = 1.55 L/s per linear meter 



liances. The minimum 
net airflow for Type I hoods used for light duty cooking 
appliances and food service preparation and cooking opera- 
tions approved for use under a Type II hood shall be deter- 
mined as follows: 



Type of Hood 


CFM per linear foot of hood 


Backshelf/pass-over 


250 


Double island canopy (per side) 


250 


Eyebrow 


250 


Single island canopy 


400 


Wall-mounted canopy 


200 



For SI: 1 cfm per linear foot = 1.55 L/s per linear meter 



507.13.5 Dishwashing appliances. The minimum net air- 
flow for Type II hoods used for dishwashing appliances 
shall be 100 CFM per linear foot of hood length. 

Exception: Dishwashing appliances and equipment 
installed in accordance with Section 507.2.2, Exception 
2. 

507.14 Noncanopy size and location. Noncanopy-type hoods 
shall be located a maximum of 3 feet (914 mm) above the cook- 
ing surface. The edge of the hood shall be set back a maximum 
of 1 foot (305 mm) from the edge of the cooking surface. 

507.15 Exhaust outlets. Exhaust outlets located within the 
hood shall be located so as to optimize the capture of particulate 
matter. Each outlet shall serve not more than a 12-foot (3658 
mm) section of hood. 

507.16 Performance test. A performance test shall be con- 
ducted upon completion and before final approval of the instal- 
lation of a ventilation system serving commercial cooking 
appliances. The test shall verify the rate of exhaust airflow 
required by Section 507.13, makeup airflow required by Sec- 
tion 508, and proper operation as specified in this chapter. The 
permit holder shall furnish the necessary test equipment and 
devices required to perform the tests. 

507.16.1 Capture and containment test. The permit 
holder shall verify capture and containment performance of 
the exhaust system. This field test shall be conducted with 
all appliances under the hooid at operating temperatures, 
with all sources of outdoor air providing makeup air for the 
hood operating and with all sources of recirculated air pro- 
viding conditioning for the space in which the hood is 
located operating. Capture and containment shall be veri- 
fied visually by observing smoke or steam produced by 
actual or simulated cooking, such as with smoke candles, 
smoke puffers, etc. 



SECTION 508 
COMMERCIAL KITCHEN MAKEUP AIR 

508.1 Makeup air. Makeup air shall be supplied during the 
operation of commercial kitchen exhaust systems that are pro- 
vided for commercial cooking appliances. The amount of 
makeup air supplied shall be approximately equal to the 
amount of exhaust air. The makeup air shall not reduce the 
effectiveness of the exhaust system. Makeup air shall be pro- 
vided by gravity or mechanical means or both. For mechanical 
makeup air systems, the exhaust and makeup air systems shall 
be electrically interlocked to insure that makeup air is provided 
whenever the exhaust system is in operation. Makeup air intake 
opening locations shall comply with Sections 401.4 and 
401.4.1. 

508.1.1 Makeup air temperature. The temperature differ- 
ential between makeup air and the air in the conditioned 
space shall not exceed 10°F (6°C). 

Exceptions: 

1 . Makeup air that is part of the air-conditioning sys- 
tem. 



2007 OREGON MECHANICAL SPECIALTY CODE 



EXHAUST SYSTEMS 




2. Makeup air that does not decrease the comfort con- 
ditions of the occupied space. 

508.2 Compensating hoods. Manufacturers of compensating 
hoods shall provide a label indicating minimum exhaust flow 
and/or maximum makeup airflow that provides capture and 
containment of the exhaust effluent. 



SECTION 509 
FIRE SUPPRESSION SYSTEMS 

509.1 Where required. Commercial cooking appliances 
required by Section 507.2. 1 to have a Type I hood shall be pro- 
vided with an approved automatic fire suppression system 
complying with Sections 509.2 through 509.5. 

509.2 Type of system. The automatic fire suppression system 
shall be of a type recognized for protection of commercial 
cooking appliance and exhaust systems of the type and 
arrangement protected. Pre-engineered automatic dry- and 
wet-chemical fire suppression systems shall be tested in accor- 
dance with UL 300. Automatic fire suppression systems, 
including pre-engineered and engineered dry- and wet-chemi- 
cal fire-suppression systems, shall be listed and labeled for spe- 
cific use as protection for commercial cooking operations and 
shall be installed in accordance with Section 304. 1 . Automatic 
fire suppression systems of the following types shall be 
installed in accordance with the referenced standard indicated: 

1. Carbon-dioxide extinguishing system, NFPA 12. 

2. Automatic sprinkler system, NFPA 13. 

3. Foam- water sprinkler system or foam-water spray sys- 
tems, NFPA 16. 

4. Dry -chemical extinguishing systems, NFPA 17. 

5. Wet-chemical extinguishing systems, NFPA 17 A. 

509.3 System actuation. Each automatic fire suppression sys- 
tem shall have both automatic and manual actuation means. A 
manual actuation device shall be located at or near a means of 
egress from the cooking area, a minimum of 10 feet (3048 mm) 
and a maximum of 20 feet (6096 mm) from the kitchen exhaust 
system. The manual actuation device shall be located a mini- 
mum of 4 feet 6 inches (1372 mm) and a maximum of 5 feet 
(1524 mm) above the floor. The manual actuation shall require 
a maximum force of 40 pounds (178 N) and a maximum move- 
ment of 14 inches (356 mm) to actuate the fire suppression sys- 
tem. 

Exception: Automatic sprinkler systems shall not be 
required to be equipped with manual actuation means. 

509.4 System interconnection. The actuation of the automatic 
fire suppression system shall automatically shut down the fuel 
or electrical power supply to the cooking appliances. The fuel 
and electrical power supply reset shall be manual. 

509.5 System test and inspection. The automatic fire suppres- 
sion system shall be acceptance-tested in accordance with the 
fire prevention code and installation standard listed in Section 
509.3 and with the manufacturer's instructions. 



SECTION 510 
HAZARDOUS EXHAUST SYSTEMS 

510.1 General. This section shall govern the design and con- 
struction of duct systems for hazardous exhaust and shall deter- 
mine where such systems are required. Hazardous exhaust 
systems are systems designed to capture and control hazardous 
emissions generated from product handling or processes, and 
convey those emissions to the outdoors. Hazardous emissions 
include flammable vapors, gases, fumes, mists or dusts, and 
volatile or airborne materials posing a health hazard, such as 
toxic or corrosive materials. For the purposes of this section, 
the health hazard rating of materials shall be as specified in 
NFPA 704. 

For the purposes of the provisions of Section 510, a labora- 
tory shall be defined as a facility where the use of chemicals is 
related to testing, analysis, teaching, research or developmen- 
tal activities. Chemicals are used or synthesized on a non-pro- 
duction basis, rather than in a manufacturing process. 

510.2 Where required. A hazardous exhaust system shall be 
required wherever operations involving the handling or pro- 
cessing of hazardous materials, in the absence of such exhaust 
systems and under normal operating conditions, have the 
potential to create one of the following conditions: 

1 . A flammable vapor, gas, fume, mist or dust is present in 
concentrations exceeding 25 percent of the lower 
flammability limit of the substance for the expected 
room temperature. 

2. A vapor, gas, fume, mist or dust with a health-hazard rat- 
ing of 4 is present in any concentration. 

3 . A vapor, gas, fume, mist or dust with a health-hazard rat- 
ing of 1 , 2 or 3 is present in concentrations exceeding 1 
percent of the median lethal concentration of the sub- 
stance for acute inhalation toxicity. 

Exception: Laboratories, as defined in Section 510.1, 
except where the concentrations listed in Item 1 are 
exceeded or a vapor, gas, fume, mist or dust with a 
health-hazard rating of 1, 2, 3 or 4 is present in concentra- 
tions exceeding 1 percent of the median lethal concentration 
of the substance for acute inhalation toxicity. 

510.2.1 Lumber yards and woodworking facilities. 

Equipment or machineiy located inside buildings at lumber 
yards and woodworking facilities which generates or emits 
combustible dust shall be provided with an approved 
dust-collection and exhaust system installed in confor- 
mance with this section and the Fire Code. Equipment and 
systems that are used to collect, process or convey combus- 
tible dusts shall be provided with an approved explo- 
sion-control system. 

510.2.2 Combustible fibers. Equipment or machinery 
within a building which generates or emits combustible 
fibers shall be provided with an approved dust-collecting 
and exhaust system. Such systems shall comply with this 
code and the Fire Code. 

510.3 Design and operation. The design and operation of the 
exhaust system shall be such that flammable contaminants are 
diluted in noncontaminated air to maintain concentrations in 



2007 OREGON MECHANICAL SPECIALTY CODE 



49 



EXHAUST SYSTEEViS 



the exhaust flow below 25 percent of the contaminant's lower 
flammability limit. 

510.4 Independent system. Hazardous exhaust systems shall 
be independent of other types of exhaust systems. Incompati- 
ble materials, as defined in the Fire Code, shall not be 
exhausted through the same hazardous exhaust system. Haz- 
ardous exhaust systems shall not share common shafts with 
other duct systems, except where such systems are hazardous 
exhaust systems originating in the same fire area. 

Exception: The provision of this section shall not apply to 
laboratory exhaust systems where all of the following con- 
ditions apply: 

1 . All of the hazardous exhaust ductwork and other labo- 
ratory exhaust within both the occupied space and the 
shafts is under negative pressure while in operation. 

2. The hazardous exhaust ductwork manifolded 
together within the occupied space must originate 
within the same fire area. 

3. Each control branch has a flow regulating device. 

4. Perchloric acid hoods and connected exhaust shall be 
prohibited from manifolding. 

5. Radioisotope hoods are equipped with filtration 
and/or carbon beds where required by the registered 
design professional. 

6. Biological safety cabinets are filtered. 

7. Provision is made for continuous maintenance of 
negative static pressure in the ductwork. 

Contaminated air shall not be recirculated to occupied areas 
unless the contaminants have been removed. Air contaminated 
with explosive or flammable vapors, fumes or dusts; flamma- 
ble, highly toxic or toxic gases; or radioactive material shall not 
be recirculated. 

510.5 Design. Systems for removal of vapors, gases and smoke 
shall be designed by the constant velocity or equal friction 
methods. Systems conveying particulate matter shall be 
designed employing the constant velocity method. 

510.5.1 Balancing. Systems conveying explosive or radio- 
active materials shall be prebalanced by duct sizing. Other 
systems shall be balanced by duct sizing with balancing 
devices, such as dampers. Dampers provided to balance 
air-flow shall be provided with securely fixed mini- 
mum-position blocking devices to prevent restricting flow 
below the required volume or velocity. 

510.5.2 Emission control. The design of the system shall 
be such that the emissions are confined to the area in which 
they are generated by air currents, hoods or enclosures and 
shall be exhausted by a duct system to a safe location or 
treated by removing contaminants. 

510.5.3 Hoods required. Hoods or enclosures shall be used 
where contaminants originate in a limited area of a space. The 
design of the hood or enclosure shall be such that air currents 
created by the exhaust systems will capture the contaminants 
and transport them directly to the exhaust duct. 

510.5.4 Contaminant capture and dilution. The velocity 
and circulation of air in work areas shall be such that con- 



taminants are captured by an airstream at the area where the 
emissions are generated and conveyed into a product-con- 
veying duct system. Contaminated air from work areas 
where hazardous contaminants are generated shall be 
diluted below the thresholds specified in Section 5 10.2 with 
air that does not contain other hazardous contaminants. 

510.5.5 Makeup air. Makeup air shall be provided at a rate 
approximately equal to the rate that air is exhausted by the 
hazardous exhaust system. Makeup-air intakes shall be 
located so as to avoid recirculation of contaminated air. 

510.5.6 Clearances. The minimum clearance between 
hoods and combustible construction shall be the clearance 
required by the duct system. 

510.5.7 Ducts. Hazardous exhaust duct systems shall 
extend directly to the exterior of the building and shall not 
extend into or through ducts and plenums. 

510.6 Penetrations. Penetrations of structural elements by a 
hazardous exhaust system shall conform to Sections 510.6.1 
through 510.6.4. 



tion: Duct penetrations within H-5 occupancies as 
allowed by the Building Code. 

510.6.1 Fire dampers. Fire dampers are prohibited in haz- 
ardous exhaust ducts. 

510.6.2 Floors. Hazardous exhaust systems that penetrate a 
floor/ceiling assembly shall be enclosed in a fire-resis- 
tance-rated shaft constructed in accordance with the Build- 
ing Code. 



assemblies. Hazardous exhaust duct systems 
that penetrate fire-resistance-rated wall assemblies shall be 
enclosed in fire-resistance-rated construction from the point 
of penetration to the outlet terminal, except where the inte- 
rior of the duct is equipped with an approved automatic fire 
suppression system. Ducts shall be enclosed in accordance 
with the Building Code requirements for shaft construction 
and such enclosure shall have a minimum fire-resis- 
tance-rating of not less than the highest fire-resistance-rated 
wall assembly penetrated. 

510.6.4 Fire walls. Ducts shall not penetrate a fire wall. 

510.7 Suppression required. Ducts shall be protected with an 
approved automatic fire suppression system installed in accor- 
dance with the Building Code. 



1 . An approved automatic fire suppression system shall 
not be required in ducts conveying materials, fumes, 
mists and vapors that are nonflammable and 
noncombustible under all conditions and at any con- 
centrations. 

2. An approved automatic fire suppression system shall 
not be required in ducts where the largest cross-sec- 
tional diameter of the duct is less than 10 inches (254 
mm). 

3. For laboratories, as defined in Section 510.1, auto- 
matic fire protection systems shall not be required in 
laboratory hoods or exhaust systems. 



50 



2007 OREGOtM SWECHANICAL SPECIALTY CODE 



EXHAUST SYSTEMS 



510.8 Duct construction. Ducts utilized to convey hazardous 
exhaust shall be constructed of approved G90 galvanized sheet 
steel, with a minimum nominal thickness as specified in Table 
510.8. 



510.9 Supports. Ducts shall be supported at intervals not 
exceeding 10 feet (3048 mm). Supports shall be constructed of 
noncombustible material. 



Nonmetallic ducts utilized in systems exhausting nonflam- 
mable corrosive fumes or vapors shall be listed and labeled. 
Nonmetallic duct shall have a flame spread index of 25 or less 
and a smoke-developed index of 50 or less, when tested in 
accordance with ASTM E 84. Ducts shall be approved for 
installation in such an exhaust system. 

Where the products being exhausted are detrimental to the 
duct material, the ducts shall be constructed of alternative 
materials that are compatible with the exhaust. 

TABLE 510.8 
MINIMUM DUCT THICKNESS 



DIAMETER OF 

DUCT OR 

MAXIMUM SIDE 

DIMENSION 


MINIMUM NOMINAL THICKNESS 


Nonabrasive 
materials 


Nonabrasive/ 
Abrasive 
materials 


Abrasive 
materials 


0-8 inches 


0.028 inch 
(No. 24 Gage) 


0.034 inch 
(No. 22 Gage) 


0.040 inch 
(No. 20 Gage) 


9-18 inches 


0.034 inch 
(No. 22 Gage) 


, 0.040 inch 
(No. 20 Gage) 


0.052 inch 
(No. 18 Gage) 


19-30 inches 


0.040 inch 
(No. 20 Gage) 


0.052 inch 
(No. 18 Gage) 


0.064 inch 
(No. 16 Gage) 


Over 30 inches 


0.052 inch 
(No. 18 Gage) 


0.064 inch 
(No. 16 Gage) 


0.079 inch 
(No. 14 Gage) 



For SI: 1 inch = 25.4 mm. 

510.8.1 Duct joints. Ducts shall be made tight with lap 
joints having a minimum lap of 1 inch (25 mm). 

510.8.2 Clearance to combustibles. Ducts shall have a 
clearance to combustibles in accordance with Table 5 10.8.2. 
Exhaust gases having temperatures in excess of 600°F 
(3 16°C) shall be exhausted to a chimney in accordance with 
Section 51 1.2. 

TABLE 510.8.2 
CLEARANCE TO COMBUSTIBLES 



TYPE OF EXHAUST OR 
TEMPERATURE OF EXHAUST (°F) 


CLEARANCE TO COMBUSTIBLES 
(inches) 


Less than 100 


1 


100-600 


12 


Flammable vapors 


6 



For SI: 1 inch = 25.4 mm, °C = [(T)- 32]/1.8. 

510.8.3 Explosion relief. Systems exhausting potentially 
explosive mixtures shall be protected with an approved 
explosion relief system or by an approved explosion preven- 
tion system designed and installed in accordance with NFPA 
69. An explosion relief system shall be designed to minimize 
the structural and mechanical damage resulting from an 
explosion or deflagration within the exhaust system. An 
explosion prevention system shall be designed to prevent an 
explosion or deflagration from occurring. 



SECTION 511 

DUST, STOCK AND REFUSE 

CONVEYING SYSTEMS 

511.1 Dust, stock and refuse conveying systems. Dust, stock 
and refuse conveying systems shall comply with the provisions 
of Section 510 and Sections 511.1.1 through 511.2. 

511.1.1 Collectors and separators. Collectors and separa- 
tors involving such systems as centrifugal separators, bag 
filter systems and similar devices, and associated supports 
shall be constructed of noncombustible materials and shall 
be located on the exterior of the building or structure. A col- 
lector or separator shall not be located nearer than 10 feet 
(3048 mm) to combustible construction or to an unprotected 
wall or floor opening, unless the collector is provided with a 
metal vent pipe that extends above the highest part of any 
roof with a distance of 30 feet (9144 mm). 

Exceptions: 

1. Collectors such as "Point of Use" collectors, close 
extraction weld fume collectors, spray finishing 
booths, stationary grinding tables, sanding booths, 
and integrated or machine-mounted collectors 
shall be permitted to be installed indoors provided 
the installation is in accordance with the Fire Code 
and the Electrical Code. 

2. Collectors in independent exhaust systems han- 
dling combustible dusts shall be permitted to be 
installed indoors provided that such collectors are 
installed in compliance with the Fire Code and the 
Electrical Code. 

511.1.2 Discharge pipe. Discharge piping shall conform to 
the requirements for ducts, including clearances required 
for high-heat appliances, as contained in this code. A deliv- 
ery pipe from a cyclone collector shall not convey refuse 
directly into the firebox of a boiler, furnace, dutch oven, 
refuse burner, incinerator or other appliance. 

511.1.3 Conveying systems exhaust discharge. An 

exhaust system shall discharge to the outside of the building 
either directly by flue or indirectly through the bin or vault 
into which the system discharges except where the contami- 
nants have been removed. Exhaust system discharge shall 
be permitted to be recirculated provided that the solid par- 
ticulate has been removed at a minimum efficiency of 99.9 
percent at 10 microns, vapor concentrations are less than 25 
percent of the LFL, and approved equipment is used to mon- 
itor the vapor concentration. 

511.1.4 Spark protection. The outlet of an open-air 
exhaust terminal shall be protected with an approved metal 
or other noncombustible screen to prevent the entry of 
sparks. 

511.1.5 Explosion relief vents. A safety or explosion relief 
vent shall be provided on all systems that convey combusti- 



2007 OREGON MECHANICAL SPECIALTY CODE 



51 



EXHAUST SYSTEMS 



ble refuse or stock of an explosive nature, in accordance 
with the requirements of the Building Code. 

511.1.5.1 Screens. Where a screen is installed in a safety 
relief vent, the screen shall be attached so as to permit 
ready release under the explosion pressure. 



511.1.5.2 Hoods. The relief vent shall be provided with 
an approved noncombustible cowl or hood, or with a 
counterbalanced relief valve or cover arranged to prevent 
the escape of hazardous materials, gases or liquids. 



511.2 Exhauslt oetlets. Outlets for exhaust that exceed 600°F 
(315°C) shall be designed as a chimney in accordance with 
Table 511.2. 



SECTION 512 
SUBSLAB SOIL EXHAUST SYSTEMS 

512.1 GenieraL When a subslab soil exhaust system is pro- 
vided, the duct shall conform to the requirements of this sec- 
tion. 



512.2 Materials. Subslab soil exhaust system duct material 
shall be air duct material listed and labeled to the requirements 
of UL 181 for Class air ducts, or any of the following piping 
materials that comply with the Plumbing Code as building san- 
itary drainage and vent pipe: cast iron; galvanized steel; brass 
or copper pipe; copper tube of a weight not less than that of 
copper drainage tube. Type DWV; and plastic piping. 

512.3 Grade. Exhaust system ducts shall not be trapped and 
shall have a minimum slope of one-eighth unit vertical in 12 
units horizontal (1 -percent slope). 

512.4 Terminatiom. Subslab soil exhaust system ducts shall 
extend through the roof and terminate at least 6 inches (152 



mm) above the roof and at least 10 feet (3048 mm) from any 
operable openings or air intake. 

512.5 Identification. Subslab soil exhaust ducts shall be per- 
manently identified within each floor level by means of a tag, 
stencil or other approved marking. 



SECTION 513 
SMOKE CONTROL SYSTEMS 

513.1 Scope and purpose. This section applies to mechanical 
and passive smoke control systems that are required by the 
Building Code. The purpose of this section is to establish mini- 
mum requirements for the design, installation and acceptance 
testing of smoke control systems that are intended to provide a 
tenable environment for the evacuation or relocation of occu- 
pants. These provisions are not intended for the preservation of 
contents, the timely restoration of operations, or for assistance 
in fire suppression or overhaul activities. Smoke control sys- 
tems regulated by this section serve a different purpose than the 
smoke- and heat- venting provisions found in Section 910 of the 
Building Code. 

513.2 General design requirements. Buildings, structures, or 
parts thereof required by this code to have a smoke control sys- 
tem or systems shall have such systems designed in accordance 
with the applicable requirements of Section 909 of the Building 
Code and the generally accepted and well-established princi- 
ples of engineering relevant to the design. The construction 
documents shall include sufficient information and detail to 
describe adequately the elements of the design necessary for 
the proper implementation of the smoke control systems. 
These documents shall be accompanied with sufficient infor- 
mation and analysis to demonstrate compliance with these pro- 
visions. 



TABLE 511.2 

CONSTRUCTBON, CLEARANCE AND TERMINATION REQUIREMENTS FOR 

SINGLE-WALL METAL CHIMNEYS 



CHIiVlNEYS 
SERVING 


MINIMUM THICKNESS 


TERMINATION 


CLEARANCE 


Walls 
(inch) 


Lining 


Above roof 

opening 

(feet) 


Above any part of 
building within (feet) 


Combustible 

construction 

(inches) 


Noncombustible 
construction 


10 


25 


50 


Interior 
inst. 


Exterior 
inst. 


Interior 
inst. 


Exterior 
inst. 


High-heat apphances 
(Over 2,000°F)^ 


0.127 
(No. 10 
MSG) 


4V2"laidon4V2"bed 


20 


— 


— 


20 


See Note c 


Low Heat appliances 
(1,000°F normal operation) 


0.127 
(No. 10 MSG) 


none 


3 


2 


— 


— 


18 


6 


Up to 18" diameter. 2" 


Medium-heat appliances 
(2,000°F maximum)'' 


0.127 
(No. 10 MSG) 


Uptol8"dia.— 2'/2" 

Over 18"-4V2" 

On 4'//' bed 


10 


— 


10 


— 


36 


24 


Over 18" d 


iameter, 4" 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm,°C = [(°F)-32]/1.8. 

a. Lining shall extend from bottom to top of outlet. 

b. Lining shall extend from 24 inches below connector to 24 feet above. 

c. Clearance shall be as specified by the design engineer and shall have sufficient clearance from buildings and structures to avoid overheating combustible materials 
(maximum 160''F). 



52 



2007 OREGON MECHANICAL SPECIALTY CODE 



EXHAUST SYSTEMS 



513.3 Special inspection and test requirements. In addition 
to the ordinary inspection and test requirements which build- 
ings, structures and parts thereof are required to undergo, 
smoke control systems subject to the provisions of Section 909 
of the Building Code shall undergo special inspections and 
tests sufficient to verify the proper commissioning of the 
smoke control design in its final installed condition. The design 
submission accompanying the construction documents shall 
clearly detail procedures and methods to be used and the items 
subject to such inspections and tests. Such commissioning 
shall be in accordance with generally accepted engineering 
practice and, where possible, based on published standards for 
the particular testing involved. The special inspections and 
tests required by this section shall be conducted under the same 
terms as found in Section 1704 of the Building Code. 

513.4 Analysis. A rational analysis supporting the types of 
smoke control systems to be employed, their methods of opera- 
tion, the systems supporting them; and the methods of con- 
struction to be utilized shall accompany the submitted 
construction documents and shall ihclude, but not be limited to, 
the items indicated in Sections 513,4.1 through 513.4.6. 

513.4.1 Stack effect. The system shall be designed such 
that the maximum probable normal or reverse stack effects 
will not adversely interfere with the system's capabilities. In 
determining the maximum probjable stack effects, altitude, 
elevation, weather history and interior temperatures shall be 
used. 

513.4.2 Temperature effect of fire. Buoyancy and expan- 
sion caused by the design fire in accordance with Section 
513.9 shall be analyzed. The system shall be designed such 
that these effects do not adversely interfere with its capabili- 
ties. 

513.4.3 Wind effect. The design shall consider the adverse 
effects of wind. Such consideration shall be consistent with 
the wind-loading provisions of the Building Code. 

513.4.4 HVAC systems. The design shall consider the 
effects of the heating, ventilating and air-conditioning 
(HVAC) systems on both smoke and fire transport. The 
analysis shall include all permutations of systems' status. 
The design shall consider the effects of fire on the HVAC 
systems. 

513.4.5 Climate. The design shall consider the effects of 
low temperatures on systems, property and occupants. Air 
inlets and exhausts shall be located so as to prevent snow or 
ice blockage. 

513.4.6 Duration of operation. All portions of active or 
passive smoke control systems shall be capable of continued 
operation after detection of the fire event for a period of not 
less than either 20 minutes or 1.5 times the calculated egress 
time, whichever is less. 

513.5 Smoke barrier construction. Smoke barriers shall 
comply with the Building Code. Smoke barriers shall be con- 
structed and sealed to limit leakage areas exclusive of protected 
openings. The maximum allowable leakage area shall be the 
aggregate area calculated using the following leakage area 
ratios: 



I.Walls: 



AM,., = 0.00100 



2. Exit enclosures: AIA^. = 0.00035 

3. All other shafts: A/A^ = 0.00150 

4. Floors and roofs : A/A^ = 0.00050 
where: 

A = Total leakage area, square feet (m^). 

Ap = Unit floor or roof area of barrier, square feet (m^). 

A^ = Unit wall area of barrier, square feet (m^). 

The leakage area ratios shown do not include openings due 
to doors, operable windows or similar gaps. These shall be 
included in calculating the total leakage area. 

513.5.1 Leakage area. Total leakage area of the barrier is 
the product of the smoke barrier gross area times the allow- 
able leakage area ratio, plus the area of other openings such 
as gaps and operable windows. Compliance shall be deter- 
mined by achieving the minimum air pressure difference 
across the barrier with the system in the smoke control mode 
for mechanical smoke control systems. Passive smoke con- 
trol systems tested using other approved means such as door 
fan testing shall be as approved by the code official. 

513.5.2 Opening protection. Openings in smoke barriers 
shall be protected by automatic-closing devices actuated by 
the required controls for the mechanical smoke control sys- 
tem. Door openings shall be protected by door assemblies 
complying with the requirements of the Building Code for 
doors in smoke barriers. 

Exceptions: 

1. Passive smoke control systems with auto- 
matic-closing devices actuated by spot-type 
smoke detectors listed for releasing service 
installed in accordance with the Building Code. 

2. Fixed openings between smoke zones which are 
protected utilizing the airflow method. 

3. In Group 1-2 where such doors are installed across 
corridors, a pair of opposite-swinging doors with- 
out a center mullion shall be installed having 
vision panels with approved fire-rated glazing 
materials in approved fire -rated frames, the area of 
which shall not exceed that tested. The doors shall 
be close-fitting within operational tolerances, and 
shall not have undercuts, louvers or grilles. The 
doors shall have head and jamb stops, astragals or 
rabbets at meeting edges and automatic-closing 
devices. Positive latching devices are not required. 

4. Group 1-3. 

5. Openings between smoke zones with clear ceiling 
heights of 14 feet (4267 mm) or greater and bank 
down capacity of greater than 20 minutes as deter- 
mined by the design fire size. 

513.5.2.1 Ducts and air transfer openings. Ducts and 
air transfer openings are required to be protected with a 
minimum Class II, 250°F (121°C) smoke damper com- 
plying with the Building Code. 

513.6 Pressurization method. The primary mechanical 
means of controlling smoke shall be by pressure differences 



2007 OREGON MECHANICAL SPECIALTY CODE 



53 



EXHAUST SYSTEMS 



across smoke barriers. Maintenance of a tenable environment 
is not required in the smoke control zone of fire origin. 

513.6.1 Mmiinum pressure difference. The minimum 
pressure difference across a smoke barrier shall be 
0.05-inch water gage (12.4 Pa) in fully sprinklered build- 
ings. 

In buildings permitted to be other than fully sprinklered, 
the smoke control system shall be designed to achieve pres- 
sure differences at least two times the maximum calculated 
pressure difference produced by the design fire. 

513.6.2 Maximum pressure difference. The maximum air 
pressure difference across a smoke barrier shall be deter- 
mined by required door-opening or closing forces. The 
actual force required to open exit doors when the system is 
in the smoke control mode shall be in accordance with the 
Building Code. Opening and closing forces for other doors 
shall be determined by standard engineering methods for 
the resolution of forces and reactions. The calculated force 
to set a side -hinged, swinging door in motion shall be deter- 
mined by: 

F = F^,+KiWAAP)f2(W-d) (Equation 5-2) 

where: 

A = Door area, square feet (m^). 

d = Distance from door handle to latch edge of door, feet 
(m). 

F = Total door opening force, pounds (N). 

F^^ = Force required to overcome closing device, pounds 
(N). 

K = Coefficient 5.2 (1.0). 

W = Door width, feet (m). 

AP = Design pressure difference, inches (Pa) water gage. 

513.7 Airflow design method. When approved by the code 
official, smoke migration through openings fixed in a perma- 
nently open position, which are located between smoke control 
zones by the use of the airflow method, shall be permitted. The 
design airflows shall be in accordance with this section. Air- 
flow shall be directed to limit smoke migration from the fire 
zone. The geometry of openings shall be considered to prevent 
flow reversal from turbulent effects. 

513.7.1 Velocity. The minimum average velocity through a 
fixed opening shall not be less than: 

v = 217.2[h (Tf- T,)/(Tj+ 460)] "^ (Equation 5-3) 

For SI: V = 1 19.9 [h (Tf - T,)IT^"^ 

where: 

H = Height of opening, feet (m). 

7} = Temperature of smoke, °F (K). 

Tg = Temperature of ambient air, °F (K). 

V = Air velocity, feet per minute (m/minute). 

513.7.2 Prohibited conditions. This method shall not be 
employed where either the quantity of air or the velocity of 
the airflow will adversely affect other portions of the smoke 



control system, unduly intensify the fire, disrupt plume 
dynamics or interfere with exiting. In no case shall airflow 
toward the fire exceed 200 feet per minute (1.02 m/s). 
Where the formula in Section 513.7.1 requires airflow to 
exceed this limit, the airflow method shall not be used. 

513.8 Exhaust method. When approved by the building offi- 
cial, mechanical smoke control for large enclosed volumes, 
such as in atriums or malls, shall be permitted to utilize the 
exhaust method. Smoke control systems using the exhaust 
method shall be designed in accordance with NFPA 92B. 

513.8.1 Exhaust rate. The height of the lowest horizontal 
surface of the accumulating smoke layer shall be maintained 
at least 6 feet (1829 mm) above any walking surface which 
forms a portion of a required egress system within the 
smoke zone. 

513.9 Design fire. The design fire shall be based on a rational 
analysis performed by the registered design professional and 
approved by the code official. The design fire shall be based on 
the analysis in accordance with Section 5 1 3.4 and this section. 

513.9.1 Factors considered. The engineering analysis shall 
include the characteristics of the fuel, fuel load, effects 
included by the fire, and whether the fire is likely to be 
steady or unsteady. 

- 513.9.2 Design fire fuel. Determination of the design fire 
shall include consideration of the type of fuel, fuel spacing 
and configuration. 

513.9.3 Heat-release assumptions. The analysis shall 
make use of the best available data from approved sources 
and shall not be based on excessively stringent limitations of 
combustible material. 

513.9.4 Sprinkler effectiveness assumptions. A docu- 
mented engineering analysis shall be provided for condi- 
tions that assume fire growth is halted at the time of 
sprinkler activation. 

513.10 Equipment. Equipment such as, but not hrnited to, 
fans, ducts, automatic dampers and balance dampers shall be 
suitable for their intended use, suitable for the probable expo- 
sure temperatures that the rational analysis indicates, and as 
approved by the code official. 

513.10.1 Exhaust fans. Components of exhaust fmis shall 
be rated and certified by the manufacturer for the probable 
temperature rise to which the components will be exposed. 
This temperature rise shall be computed by: 

T, = (QJmc) + (TJ (Equation 5-4) 

where: 

c = Specific heat of smoke at smoke-layer temperature, 
Btu/lb°F (kJ/kg X K). . 

m = Exhaust rate, pounds per second (kg/s). 

Q^ = Convective heat output of fire, Btu/s (kW). 

T ^ = Ambient temperature, °F (K). 

r J = Smoke temperature, °F (K). 

Exception: Reduced T^ as calculated based on the assur- 
ance of adequate dilution air. 



54 



2007 OREGON MECHANICAL SPECIALTY CODE 



EXHAUST SYSTEMS 



513.10.2 Ducts. Duct materials and joints shall be capable 
of withstanding the probable temperatures and pressures to 
which they are exposed as determined in accordance with 
Section 513.10.1. Ducts shall be constructed and supported 
in accordance with Chapter 6. Ducts shall be leak tested to 
1 .5 times the maximum design pressure in accordance with 
nationally accepted practices. Measured leakage shall not 
exceed 5 percent of design flow. Results of such testing shall 
be a part of the documentation procedure. Ducts shall be 
supported directly from fire-resistance-rated structural ele- 
ments of the building by substantial, noncombustible sup- 
ports. 

Exception: Flexible connections, for the purpose of 
vibration isolation, that are constructed of approved 
fire-resistance-rated materials. 

513.10.3 Equipment, inlets and outlets. Equipment shall 
be located so as to not expose uninvolved portions of the 
building to an additional fire hazard. Outdoor air inlets shall 
be located so as to minimize the potential for introducing 
smoke or flame into the building. Exhaust outlets shall be so 
located as to minimize reintroduction of smoke into the 
building and to limit exposure of the building or adjacent 
buildings to an additional fire hazard. 

513.10.4 Automatic dampers. Automatic dampers, 
regardless of the purpose for which they are installed within 
the smoke control system, shaU be listed and conform to the 
requirements of approved recognized standards. 

513.10.5 Fans. In addition to other requirements, 
belt-driven fans shall have 1.5 times the number of belts 
required for the design duty with the minimum number of 
belts being two. Fans shall be selected for stable perfor- 
mance based on normal temperature and, where applicable, 
elevated temperature. Calculations and manufacturer's fan 
curves shall be part of the documentation procedures. Fans 
shall be supported and restrained by noncombustible 
devices in accordance with the structural design require- 
ments of the Building Code. Motors driving fans shall not be 
operating beyond their nameplate horsepower (kilowatts) as 
determined from measurement of actual current draw. 
Motors driving fans shall have a minimum service factor of 
1.15. 

513.11 Power systems. The smoke control system shall be 
supplied with two sources of power. Primary power shall be the 
normal building power systems. Secondary power shall be 
from an approved standby source complying with the Electri- 
cal Code. The standby power source and its transfer switches 
shall be in a separate room from the normal power transformers 
and switch gear and shall be enclosed in a room constructed of 
not less than 1-hour fire-resistance-rated fire barriers, venti- 
lated directly to and from the exterior. Power distribution from 
the two sources shall be by independent routes. Transfer to full 
standby power shall be automatic and within 60 seconds of fail- 
ure of the primary power. The systems shall comply with the 
Electrical Code. 

513.11.1 Power sources and power surges. Elements of 
the smoke management system relying on volatile memo- 
ries or the like shall be supplied with uninterruptible power 
sources of sufficient duration to span 15-minute primary 



power interruption. Elements of the smoke management 
system susceptible to power surges shall be suitably pro- 
tected by conditioners, suppressors or other approved 
means. 

513.12 Detection and control systems. Fire detection systems 
providing control input or output signals to mechanical smoke 
control systems or elements thereof shall comply with the 
requirements of Chapter 9 of the Building Code and NFPA 72. 
Such systems shall be equipped with a control unit complying 
with UL 864 and listed as smoke control equipment. 

Control systems for mechanical smoke control systems shall 
include provisions for verification. Verification shall include 
positive confirmation of actuation, testing, manual override, 
the presence of power downstream of all disconnects and, 
through a preprogrammed weekly test sequence report, abnor- 
mal conditions audibly, visually and by printed report. 

513.12.1 Wiring. In addition to meeting the requirements 
of the Electrical Code, all wiring, regardless of voltage, 
shall be fully enclosed within continuous raceways. 

513.12.2 Activation. Smoke control systems shall be acti- 
vated in accordance with the Building Code. 

513.12.3 Automatic control. Where completely automatic 
control is required or used, the automatic control sequences 
shall be initiated from an appropriately zoned automatic 
sprinkler system complying with Section 903.3.1.1 of the 
Fire Code or from manual controls that are readily accessi- 
ble to the fire department, and any smoke detectors required 
by engineering analysis. 

513.13 Control-air tubing. Control-air tubing shall be of suf- 
ficient size to meet the required response times. Tubing shall be 
flushed clean and dry prior to final connections. Tubing shall 
be adequately supported and protected from damage. Tubing 
passing through concrete or masonry shall be sleeved and pro- 
tected from abrasion and electrolytic action. 

513.13.1 Materials. Control-air tubing shall be hard-drawn 
copper. Type L, ACR in accordance with ASTM B 42, 
ASTM B 43, ASTM B 68, ASTM B 88, ASTM B 251 and 
ASTM B 280. Fittings shall be wrought copper or brass, sol- 
der type in accordance with ASME B 16.18 or ASME B 
16.22. Changes in direction shall be made with appropriate 
tool bends. Brass compression-type fittings shall be used at 
final connection to devices; other joints shall be brazed 
using a BCuP5 brazing alloy with solidus above 1,100°F 
(593°C) and liquids below 1,500°F (816°C). Brazing flux 
shall be used on copper-to-brass joints only. 

Exception: Nonmetallic tubing used within control pan- 
els and at the final connection to devices provided all of 
the following conditions are met: 

1 . Tubing shall be listed by an approved agency for 
flame and smoke characteristics. 

2. Tubing and connected device shall be completely 
enclosed within a galvanized or paint-grade steel 
enclosure of not less than 0.030 inch (0.76 mm) 
(No. 22 galvanized sheet gage) thickness. Entry to 
the enclosure shall be by copper tubing with a pro- 



2007 OREGON MECHANICAL SPECIALTY CODE 



55 



EXHAUST SYSTEMS 



tective grommet of neoprene or teflon or by suit- 
able brass compression to male barbed adapter. 

3. Tubing shall be identified by appropriately docu- 
mented coding. 

4. Tubing shall be neatly tied and supported within 
the enclosure. Tubing bridging cabinets and doors 
or moveable devices shall be of sufficient length to 
avoid tension and excessive stress. Tubing shall be 
protected against abrasion. Tubing serving 
devices on doors shall be fastened along hinges. 

513.13.2 Isolatioim from other ftmctloes. Control tubing 
serving other than smoke control functions shall be isolated 
by automatic isolation valves or shall be an independent 
system. 

513.13.3 Testimg. Test control-air tubing at three times the 
operating pressure for not less than 30 minutes without any 
noticeable loss in gauge pressure prior to final connection to 
devices. 



The detection and con- 
trol systems shall be clearly marked at all junctions, accesses 
and terminations. 

513.15 Comtroil diagrams. Identical control diagrams shall be 
provided and maintained as required by the Fire Code. 

513.16 Fire ISghter's smoke control panel. A fire fighter's 
smoke control panel for fire department emergency response 
purposes only shall be provided in accordance with the Fire 
Code. 

513.17 System response time. Smoke control system activa- 
tion shall comply with the Fire Code. 

513.18 Acceptance testing. Devices, equipment, components 
and sequences shall be tested in accordance with the Fire Code. 

513.19 System acceptance. Acceptance of the smoke control 
system shall be in accordance with the Fire Code. 



514.1 General, Energy recovery ventilation systems shall be 
installed in accordance with this section. Where required for 
purposes of energy conservation, energy recovery ventilation 
systems shall also comply with the Building Code. 

514.2 Proliiilbited applications. Energy recovery ventilation 
systems shall not be used in the following systems: 

1. Hazardous exhaust systems covered in Section 510. 

2. Dust, stock and refuse systems that convey explosive or 
flammable vapors, fumes or dust. 

3. Smoke control systems covered in Section 513. 

4. Commercial kitchen exhaust systems serving Type I and 
Type II hoods. 

5. Clothes dryer exhaust systems covered in Section 504. 

514.3 Access. A means of access shall be provided to the heat 
exchanger and other components of the system as required for 
service, maintenance, repair or replacement. 



56 



2007 OREGON MECHANICAL SPECIALTY CODE 



CHAPTER 6 

DUCT SYSTEMS 



SECTION 601 
GENERAL 

601.1 Scope. Duct systems used for the movement of air in 
air-conditioning, heating, ventilating and exhaust systems shall 
conform to the provisions of this chapter except as otherwise 
specified in Chapters 5 and 7. 

Exception: Ducts discharging combustible material 
directly into any combustion chamber shall conform to the 
requirements of NFPA 82. 

601.2 Air movement in egress elements. Corridors shall not 
serve as supply, return, exhaust, relief or ventilation air ducts. 

Exceptions: 

1 . Use of a corridor as a source of makeup air for exhaust 
systems in rooms that open directly onto such corri- 
dors, including toilet rooms, bathrooms, dressing 
rooms, smoking lounges and janitor closets, shall be 
permitted, provided that each such corridor is directly 
supplied with outdoor air at a rate greater than the rate 
of makeup air taken from the corridor. 

2. Where located within a dwelling unit, the use of corri- 
dors for conveying return air shall not be prohibited. 

3. Where located within tenant spaces of 1,000 square 
feet (93 m^) or less in area, utilization of corridors for 
conveying return air is permitted. 

601.2.1 Corridor ceiling. Use of the space between the cor- 
ridor ceiling and the floor or roof structure above as a return 
air plenum is permitted for one or more of the following 
conditions: 

1. The corridor is not required to be of fire-resis- 
tance-rated construction; 

2. The corridor is separated from the plenum by 
fire-resistance-rated construction; 

3. The air-handling system serving the corridor is shut 
down upon activation of the air-handling unit smoke 
detectors required by this code; 

4. The air-handling system serving the corridor is shut 
down upon detection of sprinkler waterflow where 
the building is equipped throughout with an auto- 
matic sprinkler system; or 

5. The space between the corridor ceiling and the floor 
or roof structure above the corridor is used as a com- 
ponent of an approved engineered smoke control sys- 
tem. 

601.3 Exits. Equipment and ductwork for exit enclosure venti- 
lation shall comply with one of the following items: 

1 . Such equipment and ductwork shall be located exte- 
rior to the building and shall be directly connected to 
the exit enclosure by ductwork enclosed in construc- 
tion as required by the Building Code for shafts. 



2. Where such equipment and ductwork is located 
within the exit enclosure, the intake air shall be taken 
directly from the outdoors and the exhaust air shall be 
discharged directly to the outdoors, or such air shall 
be conveyed through ducts enclosed in construction 
as required by the Building Code for shafts. 

3. Where located within the building, such equipment 
and ductwork shall be separated from the remainder 
of the building, including other mechanical equip- 
ment, with construction as required by the Building 
Code for shafts. 

In each case, openings into fire-resistance-rated construc- 
tion shall be limited to those needed for maintenance and oper- 
ation and shall be protected by self-closing fire- 
resistance-rated devices in accordance with the Building Code 
for enclosure wall opening protectives. Exit enclosure ventila- 
tion systems shall be independent of other building ventilation 
systems. 

601.4 Contamination prevention. Exhaust ducts under posi- 
tive pressure, chimneys, and vents shall not extend into or pass 
through ducts or plenums. 



SECTION 602 
PLENUMS 

602.1 General. Supply, return, exhaust, relief and ventilation 
air plenums shall be limited to uninhabited crawl spaces, areas 
above a ceiling or below the floor, attic spaces and mechanical 
equipment rooms. Plenums shall be limited to one fire area. 
Fuel-fired appliances shall not be installed within a plenum. 

602.2 Construction. Plenum enclosures shall be constructed 
of materials permitted for the type of construction classifica- 
tion of the building. 

The use of gypsum boards to form plenums shall be limited 
to systems where the air temperatures do not exceed 125°F 
(52°C) and the building and mechanical system design condi- 
tions are such that the gypsum board surface temperature will 
be maintained above the airstream dew-point temperature. Air 
plenums formed by gypsum boards shall not be incorporated in 
air-handling systems utilizing evaporative coolers. 

602.2.1 Materials exposed within plenums. Except as 
required by Sections 602.2. 1 . 1 through 602.2. 1 .5, materials 
within plenums shall be noncombustible or shall have a 
flame spread index of not more than 25 and a smoke-devel- 
oped index of not more than 50 when tested in accordance 
with ASTM E 84. 

Exceptions: 

1. Rigid and flexible ducts and connectors shall con- 
form to Section 603. 

2. Duct coverings, linings, tape and connectors shall 
conform to Sections 603 and 604. 



2007 OREGON MECHANICAL SPECIALTY CODE 



57 



DUCT SYSTEMS 



3. This section shall not apply to materials exposed 
within plenums in one- and two-family dwellings. 

4. This section shall not apply to smoke detectors. 

5. Combustible materials enclosed in non- 
cumbustible raceways or enclosures, approved 
gypsum board assembhes or enclosed in materials 
listed and labeled for such application. 



L2.1ol Wiring. Combustible electrical or electronic 
wiring methods and materials, optical fiber cable, and 
optical fiber raceway exposed within a plenum shall have 
a peak optical density not greater than 0.50, an average 
optical density not greater than 0. 15, and a flame spread 
not greater than 5 feet (1524 mm) when tested in accor- 
dance with NFPA 262. Only type OFNP (plenum rated 
nonconductive optical fiber cable) shall be installed in 
plenum-rated optical fiber raceways. Wiring, cable, and 
raceways addressed in this section shall be listed and 
labeled as plenum rated and shall be installed in accor- 
dance with the Electrical Code. 



L2.1.2 Fire sprinkler piping. Plastic fire sprinkler 
piping exposed within a plenum shall be used only in wet 
pipe systems and shall have a peak optical density not 
greater than 0.50, an average optical density not greater 
than 0.15, and a flame spread of not greater than 5 feet 
(1524 mm) when tested in accordance with UL 1887. 
Piping shall be listed and labeled. 

602.2.1.3 Pneumatic tubing. Combustible pneumatic 
tubing exposed within a plenum shall have a peak optical 
density not greater than 0.50, an average optical density 
not greater than 0.15, and a flame spread of not greater 
than 5 feet (1524 mm) when tested in accordance with 
UL 1820. Combustible pneumatic tubing shall be listed 
and labeled. 

602.2.1.4 Combustible electrical equipment. Combus- 
tible electrical equipment exposed within a plenum shall 
have a peak rate of heat release not greater than 100 kilo- 
watts, a peak optical density not greater than 0.50 and an 
average optical density not greater than 0.15 when tested 
in accordance with UL 2043. Combustible electrical 
equipment shall be hsted and labeled. 

602.2.1.5 Foam plastic insulation. Foam plastic insula- 
tion used as wall or ceiling finish in plenums shall exhibit 
a flame spread index of 75 or less and a smoke-developed 
index of 450 or less when tested in accordance with 
ASTM E 84 and shall also comply with Section 
602.2.1.5.1, 602.2.1.5.2 or 602.2.1.5.3. 



L2,l,S.l Separation required. The foam plastic 
insulation shall be separated from the plenum by a 
thermal barrier complying with Section 2603.4 of the 
Building Code. 

602,2.1.5.2 Approval. The foam plastic insulation 
shall be approved based on tests conducted in accor- 
dance with Section 2603.9 of the Building Code. 



602.2.1.5.3 Covering. The foam plastic insulation 
shall be covered by corrosion-resistant steel having a 
base metal thickness of not less than 0.0160 inch (0.4 
mm). 

602.2.1.6 Semiconductor fabrication areas. Group H, 
Division 5 fabrication areas and the areas above and 
below the fabrication area that share a common air 
recirculation path with the fabrication area shall not be 
subject to the provisions of Section 602.2.1. 

602.3 Stud cavity and joist space plenums. Stud wall cavities 
and the spaces between solid floor joists to be utilized as air ple- 
nums shall comply with the following conditions: 

1 . Such cavities or spaces shall not be utilized as a plenum 
for supply air. 

2. Such cavities or spaces shall not be part of a required 
fire-resistance-rated assembly. 

3. Stud wall cavities shall not convey air from more than 
one floor level. 

4. Stud wall cavities and joist space plenums shall comply 
with the floor penetration protection requirements of the 
Building Code. 

5. Stud wall cavities and joist space plenums shall be iso- 
lated from adjacent concealed spaces by approved 
fireblocking as required in the Building Code. 

602.4 Flood hazard. For structures located in flood hazard 
areas, plenum spaces shall be located above the design flood 
elevation or shall be designed and constructed to prevent water 
from entering or accumulating within the plenum spaces dur- 
ing floods up to the design flood elevation. If the plenum spaces 
are located below the design flood elevation, they shall be capa- 
ble of resisting hydrostatic and hydrodynamic loads and 
stresses, including the effects of buoyancy, during the occur- 
rence of flooding to the design flood elevation. 



SECTION 603 
DUCT CONSTRUCTION AND INSTALLATION 

603.1 General. An air distribution system shall be designed 
and installed to supply the required distribution of air. The 
installation of an air distribution system shall not affect the fire 
protection requirements specified in the Building Code. Ducts 
shall be constructed, braced, reinforced and installed to pro- 
vide structural strength and durability. 

603.2 Duct sizing. Ducts installed within a single dwelling unit 
shall be sized in accordance with ACCA Manual D or other 
approved methods. Ducts installed within all other buildings 
shall be sized in accordance with the ASHRAE Handbook of 
Fundamentals or other equivalent computation procedure. 

603.3 Duct classification. Ducts shall be classified based on 
the maximum operating pressure of the duct at pressures of 
positive or negative 0.5, 1 .0, 2.0, 3.0, 4.0, 6.0 or 10.0 inches of 
water column. The pressure classification of ducts shall equal 
or exceed the design pressure of the air distribution in which 
the ducts are utilized. 



58 



2007 OREGON MECHANICAL SPECIALTY CODE 



DUCT SYSTEMS 



603.4 Metallic ducts. All metallic ducts shall be constructed as 
specified in the SMACNA HVAC Duct Construction Stan- 
dards — Metal and Flexible. 

Exception: Ducts installed within single dwelling units 
shall have a minimum thickness as specified in Table 603.4. 

TABLE 603.4 
DUCT CONSTRUCTION MINIMUM SHEET METAL 
THICKNESSES FOR SINGLE DWELLING UNITS 





GALVANIZED 


APPROXIMATE 


Minimum 


Equivalent 




thiclcness 


galvanized 


ALUMINUM 


DUCT SIZE 


(inches) 


gage no. 


B&S GAGE 


Round ducts and 








enclosed rectangular 








ducts 








14" or less 


0.013 


30 


26 


Over 14" 


0.016 


28 


24 


Exposed rectangular 








ducts 








14" or less 


0.016 


28 


24 


Over 14" 


0.019 


26 


22 




For SI: 1 inch = 25.4 mm. 

603.5 Nonmetallic ducts. Nonmetallic ducts shall be con- 
structed with Class or Class 1 duct material in accordance 
with UL 181. Fibrous duct construction shall conform to the 
SMACNA Fibrous Glass Duct Construction Standards or 
NAIMA Fibrous Glass Duct Construction Standards. The 
maximum air temperature within nonmetallic ducts shall not 
exceed 250°F (121°C). 

603.5.1 Gypsum ducts. The use of gypsum boards to form 
air shafts (ducts) shall be limited to return air systems where 
the air temperatures do not exceed 125°F (52°C) and the 
gypsum board surface temperature is maintained above the 
airstream dew-point temperature. Air ducts formed by gyp- 
sum boards shall not be incorporated in air-handling sys- 
tems utilizing evaporative coolers. 

603.6 Flexible air ducts and flexible air connectors. Flexible 
air ducts, both metallic and nonmetallic, shall comply with 
Sections 603.6.1, 603.6.1.1, 603.6.3 and 603.6.4. Flexible air 
connectors, both metaUic and nonmetallic, shall comply with 
Sections 603.6.2 through 603.6.4. 

603.6.1 Flexible air ducts. Flexible air ducts, both metalHc 
and nonmetallic, shall be tested in accordance with UL 181. 
Such ducts shall be hsted and labeled as Class or Class 1 
flexible air ducts and shall be installed in accordance with 
Section 304.1. 

603.6.1.1 Duct length. Flexible air ducts shall not be 
limited in length. 

603.6.2 Flexible air connectors. Flexible air connectors, 
both metallic and nonmetallic, shall be tested in accordance 
with UL 181. Such connectors shall be listed and labeled as 
Class or Class 1 flexible air connectors and shall be 
installed in accordance with Section 304. 1 . 

603.6.2.1 Connector length. Flexible air connectors 
shall be limited in length to 14 feet (4267 mm). 



603.6.2.2 Connector penetration limitations. Flexible 
air connectors shall not pass through any wall, floor or 
ceiling. 

603.6.3 Air temperature. The design temperature of air to 
be conveyed in flexible air ducts and flexible air connectors 
shall be less than 250°F (121°C). 

603.6.4 Flexible air duct and air connector clearance. 

Flexible air ducts and air connectors shall be installed with a 
minimum clearance to an apphance as specified in the appli- 
ance manufacturer's installation instructions. 

603.7 Rigid duct penetrations. Duct system penetrations of 
walls, floors, ceilings and roofs and air transfer openings in 
such building components shall be protected as required by 
Section 607. 

603.8 Underground ducts. Ducts shall be approved for under- 
ground installation. Metallic ducts not having an approved pro- 
tective coating shall be completely encased in a minimum of 2 
inches (51 mm) of concrete. 

603.8.1 Slope. Ducts shall slope to allow drainage to a point 
provided with access. 

603.8.2 Sealing. Ducts shall be sealed and secured prior to 
pouring the concrete encasement. 

603.8.3 Plastic ducts and fittings. Plastic ducts shall be 
constructed of PVC having a minimum pipe stiffness of 8 
psi (55 kPa) at 5-percent deflection when tested in accor- 
dance with ASTM D 2412. Plastic duct fittings shall be con- 
structed of either PVC or high-density polyethylene. Plastic 
duct and fittings shall be utilized in underground installa- 
tions only. The maximum design temperature for systems 
utiUzing plastic duct and fittings shall be 150°F (66°C). 

603.9 Joints and connections. All joints and connections shall 
be sealed and securely fastened in accordance with Sections 
603.9.1 and 603.9.2. 

603.9.1 Sealants. All joints of duct systems used in the 
heating or cooling of a conditioned space, including all 
flanged connections to equipment, shall be sealed by means 
of tapes, mastics, aerosol sealant, gasketing or other 
approved closure systems. Where mastic is used to seal 
openings greater than 74 inch (6.4 mm), a combination of 
mastic and mesh shall be used. 

Exception: Adjustable metal elbow gore, longitudinal 
pipe joints, integral seams within a boot fitting or similar 
fitting, and integral seams within a "Y" fitting. 

603.9.1.1 Rigid fibrous glass ducts. Closure systems 
used to seal rigid fibrous glass duct joints shall comply 
with UL 181 A and shall be marked "181A-P" for pres- 
sure-sensitive tape, "181A-M" for mastic or "181A-H" 
for heat-sensitive tape. 

603.9.1.2 Flexible air ducts. Closure systems used to 
seal flexible air duct joints and flexible air connector 
joints shall comply with UL 18 IB and shall be marked 
"181B-FX" for tape or "181B-M" for mastic. Tape shall 
be a minimum of 12 mil (0.38 mm) total thickness. 

603.9.1.3 Metal to metal ducts. Closure systems used to 
seal metal to metal duct joints shall comply with UL 



< 



2007 OREGON MECHANICAL SPECIALTY CODE 



59 



DUCT SYSTEMS 



18 IB and shall be marked "181B-FX" for tape or 
"18 IB-M" for mastic. Tape shall be a minimum of 12 mil 
(0.38 mm) total thickness, and shall include butyl rubber 
adhesive/sealant. Joints of metal to metal duct systems 
and their components shall not be sealed with cloth 
backed tapes. 



5.9,2 Fastening. Duct connections to flanges of air distri- 
bution system equipment or sheet metal fittings shall be 
mechanically fastened. Crimp joints for round ducts shall 
have a contact lap of at least 1 .5 inches (38 mm) and shall be 
mechanically fastened by means of at least three sheet metal 
screws or rivets equally spaced around the joint. Connec- 
tions of metal ducts and the inner core of flexible ducts shall 
be mechanically fastened per the manufacturer's installa- 
tion instructions. Mechanical fasteners for use with flexible 
nonmetallic air ducts shall comply with UL 18 IB and shall 
bemarkedl81B-C. 



Supports. Ducts shall be supported with approved 
hangers at intervals not exceeding 10 feet (3048 mm) or by 
other approved duct support systems designed in accordance 
with the Building Code. Flexible and other factory-made ducts 
shall be supported in accordance with the manufacturer's 
installation instructions. 



1.11 Furnace connections. Ducts connecting to a furnace 
shall have a clearance to combustibles in accordance with the 
furnace manufacturer's installation instructions. 



L12 Condensation. Provisions shall be made to prevent the 
formation of condensation on the exterior of any duct. 



hazard areas. For structures in flood hazard 
areas, ducts shall be located above the design flood elevation or 
shall be designed and constructed to prevent water from enter- 
ing or accumulating within the ducts during floods up to the 
design flood elevation. If the ducts are located below the design 
flood elevation, the ducts shall be capable of resisting hydro- 
static and hydrodynamic loads and stresses, including the 
effects of buoyancy, during the occurrence of flooding to the 
design flood elevation. 



t Location. Ducts shall not be installed in or within 4 
inches (102 mm) of the earth, except where such ducts comply 
with Section 603.8. 



.15 Mechanical protection. Ducts installed in locations 
where they are exposed to mechanical damage by vehicles or 
from other causes shall be protected by approved barriers. 

603.16 Weather protection. All ducts including linings, cov- 
erings and vibration isolation connectors installed on the exte- 
rior of the building shall be protected against the elements. 



.17 Registers, grilles and diffusers. Duct registers, grilles 
and diffusers shall be installed in accordance with the manufac- 
I turer's installation instructions. Volume dampers or other 
means of supply air adjustment shall be provided in the branch 
ducts or at each individual duct register, grille or diffuser. Each 
volume damper or other means of supply air adjustment used in 
balancing shall be provided with access. 



.17.1 Floor registers. Floor registers shall resist, with- 
out structural failure, a 200-pound (90.8 kg) concentrated 



load on a 2-inch-diameter (51 mm) disc applied to the most 
critical area of the exposed face. 

603.17.2 Prohibited locations. Diffusers, registers and 
grilles shall be prohibited in the floor or its upward exten- 
sion within toilet and bathing room floors required by the 
Building Code to have smooth, hard, nonabsorbent sur- 
faces. 

Exception: Dwelling units. 



SECTION 604 
INSULATION 

604.1 General. Duct insulation shall conform to the require- 
ments of Sections 604.2 through 604.13 and Chapter 13 of the 
Oregon Structural Specialty Code. 

604.2 Surface temperature. Ducts that operate at tempera- 
tures exceeding 120°F (49°C) shall have sufficient thermal 
insulation to limit the exposed surface temperature to 120°F 

(49°C). 

604.3 Coverings and linings. Coverings and hnings, includ- 
ing adhesives when used, shall have a flame spread index not 
more than 25 and a smoke-developed index not more than 50, 
when tested in accordance with ASTM E 84, using the speci- 
men preparation and mounting procedures of ASTM E 2231. 
Duct coverings and linings shall not flame, glow, smolder or 
smoke when tested in accordance with ASTM C 4 1 1 at the tem- 
perature to which they are exposed in service. The test tempera- 
ture shall not fall below 250°F (12rC). 

604.4 Foam plastic insulation. Foam plastic used as duct cov- 
erings and linings shall conform to the requirements of Section 
604. 

604.5 Appliance insulation. Listed and labeled appliances 
that are internally insulated shall be considered as conforming 
to the requirements of Section 604. 

604.6 Penetration of assemblies. Duct coverings shall not 
penetrate a wall or floor required to have a fire-resistance rating 
or required to be fireblocked. 

604.7 Identification. External duct insulation and fac- 
tory-insulated flexible duct shall be legibly printed or identi- 
fied at intervals not greater than 36 inches (914 mm) with the 
name of the manufacturer, the thermal resistance /?- value at the 
specified installed thickness and the flame spread and 
smoke-developed indexes of the composite materials. All duct 
insulation product /?- values shall be based on insulation only, 
excluding air films, vapor retarders or other duct components, 
and shall be based on tested C- values at 75°F (24°C) mean tem- 
perature at the installed thickness, in accordance with recog- 
nized industry procedures. The installed thickness of duct 
insulation used to determine its /?-values shall be determined as 
follows: 

1. For duct board, duct liner and factory-made rigid ducts 
not normally subjected to compression, the nominal 
insulation thickness shall be used. 

2. For duct wrap, the installed thickness shall be assumed to 
be 75 percent (25-percent compression) of nominal 
thickness. 



60 



2007 OREGON MECHANICAL SPECIALTY CODE 



DUCT SYSTEMS 



> 



3. For factory-made flexible air ducts, the installed thick- 
ness shall be determined by dividing the difference 
between the actual outside diameter and nominal inside 
diameter by two. 

604.8 Lining installation. Linings shall be interrupted at the 
area of operation of a fire damper and at a minimum of 6 inches 
(152 mm) upstream of and 6 inches (152 mm) downstream of 
electric-resistance and fuel-burning heaters in a duct system. 
Metal nosings or sleeves shall be installed over exposed duct 
liner edges that face opposite the direction of airflow. 

604.9 Thermal continuity. Where a duct liner has been inter- 
rupted, a duct covering of equal thermal performance shall be 
installed. 

604.10 Service openings. Service; openings shall not be con- 
cealed by duct coverings unless the exact location of the open- 
ing is properly identified. 

604.11 Weatherproof barriers. Insulated exterior ducts shall 
be protected with an approved weatherproof barrier. 

604.12 Internal insulation. Materials used as internal insula- 
tion and exposed to the airstream in ducts shall be shown to be 
durable when tested in accordance with UL 181. Exposed 
internal insulation that is not impermeable to water shall not be 
used to line ducts or plenums from the exit of a cooling coil to 
the downstream end of the drain pan. 



SECTION 605 
AIR FILTERS 

605.1 General. Heating and air-conditioning systems of the 
central type shall be provided with approved air filters. Filters 
shall be installed in the return air system, upstream from any 
heat exchanger or coil, in an approved convenient location. 
Liquid adhesive coatings used on filters shall have a flash point 
not lower than 325°F (163°C). 

605.2 Approval. Media- type and electrostatic-type air filters 
shall be listed and labeled. Media-type air filters shall comply 
with UL 900. High efficiency particulate air filters shall com- 
ply with UL 586. Electrostatic-type air filters shall comply with 
UL 867. Air filters utilized within dwelling units shall be 
designed for the intended application and shall not be required 
to be listed and labeled. 

605.3 Airflow over the filter. Ducts shall be constructed to 
allow an even distribution of air over the entire filter. 



SECTION 606 
SMOKE DETECTION SYSTEMS CONTROL 

606.1 Controls required. Air distribution systems shall be 
equipped with smoke detectors listed and labeled for installa- 
tion in air distribution systems, as required by this section. Duct 
smoke detectors shall comply with UL 268A. Other smoke 
detectors shall comply with UL 268. 

606.2 Where required. Smoke detectors shall be installed 
where indicated in Sections 606.2.1 through 606.2.3. 



Exception: Smoke detectors shall not be required where air 
distribution systems are incapable of spreading smoke 
beyond the enclosing walls, floors and ceilings of the room 
or space in which the smoke is generated. 

606.2.1 Return air systems. Smoke detectors shall be 
installed in return air systems with a design capacity greater 
than 2,000 cfm (0.9 m^/s), in the return air duct or plenum 
upstream of any filters, exhaust air connections, outdoor air 
connections, or decontamination equipment and appli- 
ances. 

Exception: Smoke detectors are not required in the 
return air system where all portions of the building 
served by the air distribution system are protected by 
, area smoke detectors connected to a fire alarm system in 
accordance with the Fire Code. The area smoke detec- 
tion system shall comply with Section 606.4. 

606.2.2 Common supply and return air systems. Where 
multiple air-handling systems share common supply or 
return air ducts or plenums with a combined design capacity 
greater than 2,000 cfm (0.9 mVs), the return air system shall 
be provided with smoke detectors in accordance with Sec- 
tion 606.2.1. 

Exception: Individual smoke detectors shall not be 
required for each fan-powered terminal unit, provided 
that such units do not have an individual design capacity 
greater than 2,000 cfm (0.9 mVs) and will be shut down 
by activation of one of the following: 

1. Smoke detectors required by Sections 606.2.1 and 
606.2.3. 

2. An approved area smoke detector system located 
in the return air plenum serving such units. 

3 . An area smoke detector system as prescribed in the 
exception to Section 606.2.1 . 

In all cases, the smoke detectors shall comply with Sec- 
tions 606.4 and 606.4.1. 

606.2.3 Return air risers. Where return air risers serve two 
or more stories and serve any portion of a return air system 
having a design capacity greater than 15,000 cfm (7.1 mVs), 
smoke detectors shall be installed at each story. Such smoke 
detectors shall be located upstream of the connection 
between the return air riser and any air ducts or plenums. 

606.3 Installation. Smoke detectors required by this section 
shall be installed in accordance with NFPA 72. The required 
smoke detectors shall be installed to monitor the entire airflow 
conveyed by the system including return air and exhaust or 
relief air. Access shall be provided to smoke detectors for 
inspection and maintenance. 

606.4 Controls operation. Upon activation, the smoke detec- 
tors shall shut down all operational capabilities of the air distri- 
bution system in accordance with the listing and labeling of 
appliances used in the system. Air distribution systems that are 
part of a smoke control system shall switch to the smoke con- 
trol mode upon activation of a detector. 



2007 OREGON MECHANICAL SPECIALTY CODE 



61 



DUCT SYSTEft/iS 



The duct smoke detectors shall be 
connected to a fire alarm system. The actuation of a duct 
smoke detector shall activate a visible and audible supervi- 
sory signal at a constantly attended location. 



TABLE 607.3.1 
FIRE DAMPER RATING 



1. The supervisory signal at a constantly attended 
location is not required where the duct smoke 
detector activates the building's alarm-indicating 
appliances. 

2. In occupancies not required to be equipped with a 
fire alarm system, actuation of a smoke detector 
shall activate a visible and an audible signal in an 
approved location. Duct smoke detector trouble 
conditions shall activate a visible or audible signal 
in an approved location and shall be identified as 
air duct detector trouble. 



SECTION 607 
DUCT AND TRANSFER OPENINGS 

607.1 GemeraL The provisions of this section shall govern the 
protection of duct penetrations and air transfer openings in 
assemblies required to be protected. 



M.l Ducts without dampers. Ducts that penetrate 
fire-resistance-rated assemblies and are not required by this 
section to have dampers shall comply with the requirements 
of Section 712 of the Building Code. 



hi Installation. Fire dampers, smoke dampers, combina- 

I tion fire/smoke dampers and ceiling radiation dampers located 

within air distribution and smoke control systems shall be 

installed in accordance with the requirements of this section, 

and the manufacturer's installation instructions and listing. 

607.2.1 Smoke control system. Where the installation of a 
fire damper will interfere with the operation of a required 
smoke control system in accordance with Section 513, 
approved alternative protection shall be utilized. 



.2.2 Hazardous exhaust ducts. Fire dampers for haz- 
ardous exhaust duct systems shall comply with Section 510. 



^3 Damper testing and ratings. Dampers shall be listed 
and bear the label of an approved testing agency indicating 
compliance with the standards in this section. Fire dampers 
shall comply with the requirements of UL 555. Only fire damp- 
ers labeled for use in dynamic systems shall be installed in 
heating, ventilation and air-conditioning systems designed to 
operate with fans on during a fire. Smoke dampers shall com- 
ply with the requirements of UL 555S. Combination 
fire/smoke dampers shall comply with the requirements of both 
UL 555 and UL 555 S. Ceiling radiation dampers shall comply 
with the requirements of UL 555C. 



TYPE OF 
PENETRATION 


MINIMUM 

DAMPER 

RATING (hour) 


Less than 3-hour fire-resistance-rated assemblies 


\\ 


3 -hour or greater fire-resistance-rated assembles 


3, 



13A Fire protection rating. Fire dampers shall have the 
minimum fire protection rating specified in Table 607.3.1 
for the type of penetration. 



607.3.1.1 Fire damper actuating device. The fire 
damper actuating device shall meet one of the following 
requirements: 

1 . The operating temperature shall be approximately 
50°F (27.8°C) above the normal temperature 
within the duct system, but not less than 160°F 
(71°C). 

2. The operating temperature shall be not more than 
286°F (141°C) where located in a smoke control 
system complying with Section 513. 

3. Where a combination fire/smoke damper is 
located in a smoke control system complying with 
Section 5 1 3, the operating temperature rating shall 
be approximately 50°F (27.8°C) above the maxi- 
mum smoke control system designed operating 
temperature, or a maximum temperature of 350°F 
(177°C). The temperature shall not exceed the UL 
555S degradation test temperature rating for a 
combination fire/smoke damper. 

607.3.2 Smoke damper ratings. Smoke damper leakage 
ratings shall not be less than Class II. Elevated temperature 
ratings shall be riot less than 250°F (121°C). 

607,3.2.1 Smoke damper actuation methods. The 
smoke damper shall close upon actuation of a listed 
smoke detector or detectors installed in accordance with 
Section 607 of this code and Sections 907.10 and 907.1 1 
of the Building Code and one of the following methods, 
as applicable: 

1 . Where a damper is installed within a duct, a smoke 
detector shall be installed in the duct within 5 feet 
(1524 mm) of the damper with no air outlets or 
inlets between the detector and the damper. The 
detector shall be listed for the air velocity, temper- 
ature and humidity anticipated at the point where it 
is installed. Other than in mechanical smoke con- 
trol systems, dampers shall be closed upon fan 
shutdown where local smoke detectors require a 
minimum velocity to operate. 

2. Where a damper is installed above smoke barrier 
doors in a smoke barrier, a spot-type detector listed 
for releasing service shall be installed on either 
side of the smoke barrier door opening. 

3. Where a damper is installed within an unducted 
opening in a wall, a spot- type detector listed for 
releasing service shall be installed within 5 feet 
(1524 mm) horizontally of the damper. 



62 



2007 OREGON MECHANSCAL SPECIALTY CODE 



DUCT SYSTEMS 




4. Where a damper is installed in a corridor wall or 
ceiling, the damper shall be permitted to be con- 
trolled by a smoke detection system installed in the 
corridor. 

5. Where a total-coverage smoke detector system is 
provided within areas served by an H V AC system, 
dampers shall be permitted to be controlled by the 
smoke detection system. 

^4 Access and identification. Fire and smoke dampers 
shall be provided with an approved means of access, large 
enough to permit inspection and maintenance of the damper 
and its operating parts. The access shall not affect the integrity 
of fire-resistance-rated assemblies. The access openings shall 
not reduce the fire-resistance rating of the assembly. Access 
points shall be permanently identified on the exterior by a label 
having letters not less than 0.5 inch (12.7 mm) in height read- 
ing: FIRE/SMOKE DAMPER, SMOKE DAMPER or FIRE 
DAMPER. Access doors in ducts shall be tight fitting and suit- 
able for the required duct construction. 



^5 Where required. Fire dampers, smoke dampers, combi- 
nation fire/smoke dampers and ceiling radiation dampers shall 
be provided at the locations prescribed in Sections 607.5.1 
through 607.5.5. Where an assembly is required to have both 
fire dampers and smoke dampers, combination fire/smoke 
dampers or a fire damper and a smoke damper shall be 
required. 



.5.1 Fire walls. Ducts and air transfer openings permit- 
ted in fire walls in accordance with Section 705.11 of the 
Building Code shall be protected with listed fire dampers 
installed in accordance with their listing. 



.5.2 Fire barriers. Ducts and air transfer openings that 
penetrate fire barriers shall be protected with listed fire 
dampers installed in accordance with their listing. Ducts 
and air transfer openings shall not penetrate exit enclosures 
and exit passageways except as permitted by Sections 
1020.1.2 and 1021.5, respectively, of the Building Code. 

Exception: Fire dampers are not required at penetrations 
of fire barriers where any of the following apply: 

1 . Penetrations are tested in accordance with ASTM 
E 1 19 as part of the fire-resistance-rated assembly. 

2. Ducts are used as part of an approved smoke con- 
trol system in accordance with Section 513 and 
where the fire damper would interfere with the 
operation of the smoke control system. 

3. Such walls are penetrated by ducted HVAC sys- 
tems, have a required fire-resistance rating of 1 
hour or less, are in areas of other than Group H and 
are in buildings equipped throughout with an auto- 
matic sprinkler system in accordance with Section 
903.3.1.1 or 903.3.1.2 of the Building Code. For 
the purposes of this exception, a ducted HVAC 
system shall be a duct system for the structure's 
HVAC system.6Such a duct system shall be con- 
structed of sheet steelnot less than 26 gage [0.0217 
inch (0.55 mm)] thickness and shall be continuous 
from the air-handling appliance or equipment to 
the air outlet and inlet terminals. 



607.5.3 Fire partitions. Ducts and air transfer openings 
that penetrate fire partitions shall be protected with listed 
fire dampers installed in accordance with their listing. 

Exception: In occupancies other than Group H, fire 
dampers are not required where any of the following 
apply: 

1. The partitions are tenant separation or corridor 
walls in buildings equipped throughout with an 
automatic sprinkler system in accordance with 
Section 903.3.1.1 or 903.3.1.2 of the Building 
Code and the duct is protected as a through pene- 
tration in accordance with Section 712 of the 
Building Code. 

2. The partitions are tenant partitions in covered mall 
buildings where the walls are not required by pro- 
visions elsewhere in the Building Code to extend 
to the underside of the floor or roof deck above. 

3. The duct system is constructed of approved mate- 
rials in accordance with Section 603 and the duct 
penetrating the wall complies with all of the fol- 
lowing requirements: 

3.1. The duct shall not exceed 100 square inches 
(0.06 m^). 

3.2. The duct shall be constructed of steel a mini- 
mum of 0.0217-inch (0.55 mm) in thickness. 

3.3. The duct shall not have openings that commu- 
nicate the corridor with adjacent spaces or 
rooms. 

3.4. The duct shall be installed above a ceiling. 

3.5. The duct shall not terminate at a wall register 
in the fire-resistance-rated wall. 

3.6. A minimum 12-inch-long (305 mm) by 
0.060-inch-thick (1.52 mm) steel sleeve shall 
be centered in each duct opening. The sleeve 
shall be secured to both sides of the wall and 
all four sides of the sleeve with minimum 
lV2-inch by 1 V2-ihch by 0.060-inch (38 mm 
by 38 mm by 1.52 mm) steel retaining angles. 
The retaining angles shall be secured to the 
sleeve and the wall with No. 10 (M5) screws. 
The annular space between the steel sleeve 
and the wall opening shall be filled with rock 
(mineral) wool batting on all sides. 

607.5.4 Corridors/smoke barriers. A listed smoke 
damper designed to resist the passage of smoke shall be pro- 
vided at each point a duct or air transfer opening penetrates a 
smoke barrier wall or a corridor enclosure required to have 
smoke and draft control doors in accordance with the Build- 
ing Code. Smoke dampers and smoke damper actuation 
methods shall comply with Section 607.5.4.1. 

Exceptions: 

1. Smoke dampers are not required in corridor pene- 
trations where the building is equipped throughout 
with an approved smoke control system in accor- 
dance with Section 513 and smoke dampers are not 



2007 OREGON MECHANICAL SPECIALTY CODE 



63 



DUCT SYSTEMS 



necessary for the operation and control of the sys- 
tem. 

2. Smoke dampers are not required in smoke barrier 
penetrations where the openings in ducts are Hm- 
ited to a single smoke compartment and the ducts 
are constructed of steel. 

3. Smoke dampers are not required in corridor pene- 
trations where the duct is constructed of steel not 
less than 0.019 inch (0.48 mm) in thickness and 
there are no openings serving the corridor. 



> 



^5.4ol Smoke damper. The smoke damper shall 
close upon actuation of a listed smoke detector or detec- 
tors installed in accordance with the Building Code and 
one of the following methods, as applicable: 

1 . Where a damper is installed within a duct, a smoke 
detector shall be installed in the duct within 5 feet 
(1524 nrni) of the damper with no air outlets or 
inlets between the detector and the damper. The 
detector shall be listed for the air velocity, temper- 
ature and humidity anticipated at the point where it 
is installed. 

2. Where a damper is installed above smoke barrier 
doors in a smoke barrier, a spot-type detector listed 
for releasing service shall be installed on either 
side of the smoke barrier door opening. 

3. Where a damper is installed within an unducted 
opening in a wall, a spot-type detector listed for 
releasing service shall be installed within 5 feet 
(1524 mm) horizontally of the damper. 

4. Where a damper is installed in a corridor wall, the 
damper shall be permitted to be controlled by a 
smoke detection system installed in the corridor. 

5. Where a total-coverage smoke detector system is 
provided within all areas served by an HVAC sys- 
tem, dampers shall be permitted to be controlled 
by the smoke detection system. 



enclosures. Shaft enclosures that are permit- 
ted to be penetrated by ducts and air transfer openings shall 
be protected with listed fire and smoke dampers installed in 
accordance with their listing. 



1 . Fire dampers are not required at penetrations of 
shafts where: 

1.1. Steel exhaust subducts extend at least 22 
inches (559 mm) vertically in exhaust 
shafts provided that there is a continuous 
airflow upward to the outdoors; 

1.2. Penetrations are tested in accordance with 
ASTM E 119 as part of the fire-resis- 
tance-rated assembly; 

1.3. Ducts are used as part of an approved smoke 
control system in accordance with Section 
909 of the Building Code, and where the fire 
damper will interfere with the operation of 
the smoke control system; or 



1.4. The penetrations are in parking garage 
exhaust or supply shafts that are separated 
from other building shafts by not less than 
2-hour fire-resistance-rated construction. 

2. In Group B and R occupancies equipped | 
throughout with an automatic sprinkler system 
in accordance with Section 903.3.1.1 of the 
Building Code, smoke dampers are not required 
at penetrations of shafts where kitchen, clothes | 
dryer, bathroom and toilet room exhaust open- 
ings with steel exhaust subducts, having a wall 
thickness of at least 0.019 inch (0.48 mm) 
extend at least 22 inches (559 mm) vertically 
and the exhaust fan at the upper terminus is 
powered continuously in accordance with the 
provisions of Section 909.11 of the Building 
Code, and maintains airflow upward to the out- 
doors. 

3. Smoke dampers are not required at penetration ^ 
of exhaust or supply shafts in parking garages 
that are separated from other building shafts by 
not less than 2-hour fire-resistance-rated con- 
struction. 

4. Smoke dampers are not required at penetrations 
of shafts where ducts are used as part of an 
approved mechanical smoke control system 
designed in accordance with Section 909 of the 
Building Code and where the smoke damper 
will interfere with the operation of the smoke 
control system. 

607.6 Horizontal assemblies. Penetrations by air ducts of a 
floor, floor/ceiling assembly or the ceiling membrane of a 
roof/ceiling assembly shall be protected by a shaft enclosure 
that complies with Section 707 and Sections 716.6.1 through 
716.6.3 the Building Code or shall comply with Sections 
607.6.1 through 607.6.3. 

607.6.1 Through penetrations. In occupancies other than 
Groups 1-2 and 1-3, a duct constructed of approved materials 
in accordance with Section 603 that peneti'ates a fire-resis- 
tance-rated floor/ceiling assembly that connects not more 
than two stories is permitted without shaft enclosure protec- 
tion provided that a listed fire damper is installed at the floor 
line or the duct is protected in accordance with Section 
712.4 of the Building Code. For air transfer openings, see 
Exception 7 to Section 707.2 of the Building Code. 

Exception: A duct is permitted to penetrate three floors 
or less without a fire damper at each floor provided it 
meets all of the following requirements. 

1 . The duct shall be contained and located within the 
cavity of a wall and shall be constructed of steel not 
less than 0.019 inch (0.48 mm) (26 gage) in thick- 
ness. 

2. The duct shall open into only one dwelling unit or 
sleeping unit and the duct system shall be continu- 
ous from the unit to the exterior of the building. 

3. The duct shall not exceed 4-inch (102 mm) nomi- 
nal diameter and the total area of such ducts shall 



64 



2007 OREGON MECHANICAL SPEC5ALTY CODE 



DUCT SYSTEMS 




not exceed 100 square inches (0.065 m^) for any 
100 square feet (9.3 m^) of the floor area. 

4. The annular space around the duct is protected 
with materials that prevent the passage of flame 
and hot gases sufficient to ignite cotton waste 
where subjected to ASTM E 1 19 time-temperature 
conditions under a minimum positive pressure dif- 
ferential of 0.01 inch (2.49 Pa) of water at the loca- 
tion of the penetration , for the time period 
equivalent to the fire-resistance rating of the con- 
struction penetrated. 

5. Grille openings located in a ceiling of a fire-resis- 
tance-rated floor/ceiling or roof/ceiling assembly 
shall be protected with a listed ceiling radiation 
damper installed in accordance with Section 
607.6.2. 

607.6.2 Membrane penetrations. Ducts and air transfer 
openings constructed of approved materials, in accordance 
with Section 603, that penetrate the ceiling membrane of a 
fire-resistance-rated floor/ceiling or roof/ceiling assembly 
shall be protected with one of the following: 

1 . A shaft enclosure in accordance with Sections 707 of 
the Building Code. 

2. A listed ceiling radiation damper installed at the ceil- 
ing line where a duct penetrates the ceiling of a 
fire-resistance-rated floor/ceiling or roof/ceiling 
assembly. 

3. A listed ceiling radiation damper installed at the ceil- 
ing line where a diffuser with no duct attached pene- 
trates the ceiling of a fire-resistance-rated 
floor/ceiling or roof/ceiling assembly. 

607.6.2.1 Ceiling radiation dampers. Ceiling radiation 
dampers shall be tested in accordance with UL 555C and 
installed in accordance with the manufacturer's installa- 
tion instructions and listing. Ceiling radiation dampers 
are not required where either of the following apply: 

1 . Tests in accordance with ASTM E 1 19 have shown 
that ceiling radiation dampers are not necessary in 
order to maintain the fire-resistance rating of the 
assembly. 

2. Where exhaust duct penetrations are protected in 
accordance with Section 712.4.1.2 of the Building 
Code and the exhaust ducts are located within the 
cavity of a wall, and do not pass through another 
dwelling unit or tenant space. 

607.6.3 Nonfire-resistance-rated floor assemblies. Duct 
systems constructed of approved materials in accordance 



with Section 603 that penetrate nonfire-resistance-rated 
floor assemblies shall be protected by any of the following 
methods: 

1. A shaft enclosure in accordance with Section 707 of 
the Building Code. 

2. The duct connects not more than two stories, and the 
annular space around the penetrating duct is protected 
with an approved noncombustible material that 
resists the free passage of flame and the products of 
combustion. 

3. The duct connects not more than three stories, and the 
annular space around the penetrating duct is protected 
with an approved noncombustible material that 
resists the free passage of flame and the products of 
combustion, and a listed fire damper is installed at 
each floor line. 

Exception: Fire dampers are not required in ducts within 
individual residential dwelling units. 

607.7 Flexible ducts and air connectors. Flexible ducts and 
air connectors shall not pass through any fire-resistance-rated 
assembly. 



2007 OREGON MECHANICAL SPECIALTY CODE 



65 



66 2007 OREGON WiECHANlCAL SPECIALTY CODE 



CHAPTER? 

COMBUSTION AIR 



SECTION 701 
GENERAL 

701.1 Scope. The provisions of this chapter shall govern the 
requirements for combustion and dilution air for fuel-burning 
appliances other than gas-fired appliances. The requirements 
for combustion and dilution air for gas-iFired appliances shall be 
in accordance with Appendix C. 

701.2 Combustion and dilution air required. Every room or 
space containing fuel-burning appliances shall be provided 
with combustion and dilution air as required by this code. Com- 
bustion and dilution air shall be provided in accordance with 
Section 702, 703, 704, 705, 706 or 707 or shall be provided by 
an approved engineered system. Direct vent appliances or 
equipment that do not draw combustion air from inside of the 
building are not required to be considered in the determination 
of the combustion and dilution air requirements. Combustion 
air requirements shall be determined based on the simultaneous 
operation of all fuel-burning appliances drawing combustion 
and dilution air from the room or space. 

701.3 Circulation of air. The equipment and appliances within 
every room containing fuel-burning appliances shall be 
installed so as to allow free circulation of air. Provisions shall 
be made to allow for the simultaneous operation of mechanical 
exhaust systems, fireplaces or other equipment and appliances 
operating in the same room or space from which combustion 
and dilution air is being drawn. Such provisions shall prevent 
the operation of such appliances, equipment and systems from 
affecting the supply of combustion and dilution air. 

Exception: Rooms provided with exhaust air systems such 
as kitchens, baths, toilet rooms and smoking lounges may 
use air supplied through adjacent habitable or occupiable 
spaces to compensate for the air exhausted. 

701.3.1 Special conditions. In buildings containing com- 
bustion appliances, equipment or fireplaces not equipped 
with forced or induced draft or separated from the habitable 
area, where an individual exhaust appliance exceeds 350 
cubic feet per minute (cfm) (165.2 L/s), makcyup air of suf- 
ficient quantity to equal that being exhausted shall be sup- 
plied to the area being ventilated. In such cases, the 
minimum size make-up air duct shall be 6 inches (152 mm) 
in diameter or equivalent area. 

701.4 Crawl space and attic space. For the purposes of this 
chapter, an opening to a naturally ventilated crawl space or attic 
space shall be considered equivalent to an opening to the out- 
doors. 

701.4.1 Crawl space. Where lower combustion air open- 
ings connect with crawl spaces, such spaces shall have 
unobstructed openings to the outdoors at least twice that 
required for the combustion air openings. The height of the 
crawl space shall comply with the requirements of the 
Building Code and shall be without obstruction to the free 
flow of air. 



701.4.2 Attic space. Where combustion air is obtained from 
an attic area, the attic ventilating openings shall not be sub- 
ject to ice or snow blockage, and the attic shall have not less 
than 30 inches (762 mm) vertical clear height at its maxi- 
mum point. Attic ventilation openings shall be sufficient to 
provide the required volume of combustion air and the attic 
ventilation required by the Building Code. The combustion 
air openings shall be provided with a sleeve of not less than 
0,019-inch (0.5 mm) (No. 26 Gage) galvanized steel or 
other approved material extending from the appliance 
enclosure to at least 6 inches (152 mm) above the top of the 
ceiling joists and insulation. 

701,5 Prohibited sources. Openings and ducts shall not con- 
nect appliance enclosures with a space in which the operation 
of a, fan will adversely affect the flow of the combustion air. 
Combustion air shall not be obtained from a hazardous loca- 
tion, except where the fuel-fired appliances are located within 
the hazardous location and are installed in accordance with this 
code. Combustion air shall not be taken from a refrigeration 
machinery room, except where a refrigerant vapor detector 
system is installed to automatically shut off the combustion 
process in the event of refrigerant leakage. Combustion air 
shall not be obtained from any location below the design flood 
elevation. 



SECTION 702 
INDOOR AIR 

702il All air from indoors. Combustion and dilution air shall 
be permitted to be obtained entirely from the indoors in build- 
ings that are not of unusually tight construction. In buildings of 
unusually tight construction, combustion air shall be obtained 
from the outdoors in accordance with Section 703, 705, 706 or 
707. 

702,2 Air from the same room or space. The room or space 
containing fuel-burning appliances shall be an unconfined 
space as defined in Section 202. 

7023 Air from adjacent spaces. Where the volume of the 
room in which the fuel-burning appliances are located does not 
comply with Section 702.2, additional indoor combustion and | 
dilution air shall be obtained by opening the room to adjacent 
spaces, so that the combined volume of all communicating 
spaces meets the volumetric requirement of Section 702.2. 
Openings connecting the spaces shall comply with Section 
702.3.1 and 702.3.2. 

702.3.1 Number and location of openings. Two openings 
shall be provided, one within 1 foot (305 mm) of the ceiling 
of the room and one within 1 foot (305 mm) of the floor. 

702.3.2 Size of openings. The net free area of each opening, 
calculated in accordance with Section 708, shall be a mini- 
mum of 1 square inch per 1,000 Btu/h (2201 mm^/kW) of 
input rating of the fuel-burning appliances drawing com- 



2007 OREGON MECHANICAL SPECIALTY CODE 



67 



COWIBUSTBON AIB 



bustion and dilution air from the communicating spaces and 
shall be not less than 100 square inches (64 516 mm^). 



SECTION 703 
OUTDOOR AIR 

LI All air from the outdoors. Where all combustion and 
dilution air is to be provided by outdoor air, the required com- 
bustion and dilution air shall be obtained by opening the room 
to the outdoors. Openings connecting the room to the outdoor 
air shall comply with Sections 703.1.1 through 703.1.4. 

703.1.1 Number and location of openings. Two openings 
shall be provided, one within 1 foot (305 mm) of the ceiling 
of the room and one within 1 foot (305 mm) of the floor. 



5.1.2 Size of direct openings. The net free area of each 
direct opening to the outdoors, calculated in accordance 
with Section 709, shall be a minimum of 1 square inch per 
4,000 Btu/h (550 mm^/kW) of combined input rating of the 
fuel-burning appliances drawing combustion and dilution 
air from the room. 

703.1.3 Size of horizontal openings. The net free area of 
each opening, calculated in accordance with Section 709 
and connected to the outdoors through a horizontal duct, 
shall be a minimum of 1 square inch per 2,000 Btu/h (1 100 
mm^/kW) of combined input rating of the fuel-burning 
appliances drawing combustion and dilution air from the 
room. The cross-sectional area of the duct shall be. equal to 
or greater than the required size of the opening. 

703.1.4 Size of vertical openings. The net free area of each 
opening, calculated in accordance with Section 709 and 
connected to the outdoors through a vertical duct, shall be a 
minimum of 1 square inch per 4,000 Btu/h (550 mm^/kW) 
of combined input rating of the fuel-burning appliances 
drawing combustion and dilution air from the room. The 
cross-sectional area of the duct shall be equal to or greater 
than the required size of the opening. 



SECTION 704 

COMBINED USE OF INDOOR AND OUTDOOR AIR 

(CONDITION 1) 

704.1 Combination of air from indoors and outdoors. This 
section shall apply only to appliances located in confined 
spaces in buildings not of unusually tight construction. Where 
the volumes of rooms and spaces are combined for the purpose 
of providing indoor combustion air, such rooms and spaces 
shall communicate through permanent openings in compliance 
with Sections 702.3.1 and 702.3.2. The required combustion 
and dilution air shall be obtained by opening the room to the 
outdoors using a combination of indoor and outdoor air, pro- 
rated in accordance with Section 704.1.6. The ratio of interior 
spaces shall comply with Section 704.1.5. The number, loca- 
tion and ratios of openings connecting the space with the out- 
door air shall comply with Sections 704.1.1 through 704.1.4. 

704.1.1 Number and location of openings. At least two 
openings shall be provided, one within 1 foot (305 nrni) of 
the ceiling of the room and one within 1 foot (305 mm) of 
the floor. 



704.1.2 Ratio of direct openings. Where direct openings to 
the outdoors are provided in accordance with Section 703. 1 , 
the ratio of direct openings shall be the sum of the net free 
areas of both direct openings to the outdoors, divided by the 
sum of the required areas for both such openings as deter- 
mined in accordance with Section 703. 1 .2. 

704.1.3 Ratio of horizontal openings. Where openings 
connected to the outdoors through horizontal ducts are pro- 
vided in accordance with Section 703.1, the ratio of hori- 
zontal openings shall be the sum of the net free areas of both 
such openings, divided by the sum of the required areas for 
both such openings as determined in accordance with Sec- 
tion 703.1.3. 

704.1.4 Ratio of vertical openings. Where openings con- 
nected to the outdoors through vertical ducts are provided in 
accordance with Section 703.1, the ratio of vertical open- 
ings shall be the sum of the net free areas of both such open- 
ings, divided by the sum of the required areas for both such 
openings as determined in accordance with Section 703. 1 .4. 

704.1.5 Ratio of interior spaces. The ratio of interior 
spaces shall be the available volume of all communicating 
spaces, divided by the required volume as determined in 
accordance with Sections 702.2 and 702.3. 

704.1.6 Prorating of indoor and outdoor air. In spaces 
that utilize a combination of indoor and outdoor air, the sum 
of the ratios of all direct openings, horizontal openings, ver- 
tical openings and interior spaces shall equal or exceed 1 . 



SECTION 705 

COMBINED USE OF INDOOR AND OUTDOOR AIR 

(CONDITION 2) 

705.1 General. This section shall apply only to appliances 
located in unconfmed spaces in buildings of unusually tight 
construction. Combustion air supplied by a combined use of 
indoor and outdoor air shall be supplied through openings and 
ducts extending to the appliance room or to the vicinity of the 
appliance. 

705.1.1 Openings and supply ducts. Openings shall be 
provided, located and sized in accordance with Sections 
702.3.1 and 702.3.2; additionally, there shall be one open- 
ing to the outdoors having a free area of at least 1 square inch 
per 5,000 Btu/h (440 mm^/kW) of total input of all appli- 
ances in the space. 



SECTION 706 
FORCED COMBUSTION AIR SUPPLY 

706.1 General. Where all combustion air and dilution air is 
provided by a mechanical forced-air system, the combustion 
air and dilution air shall be supplied at the minimum rate of 1 
cfm per 2,400 Btu/h [0.00067 mV(s » kW)] of combined input 
rating of all the fuel-burning appliances served. Each of the 
appliances served shall be electrically interlocked to the 
mechanical forced-air system so as to prevent operation of the 
appliances when the mechanical system is not in operation. 
Where combustion air and dilution air is provided by thb build- 
ing's mechanical ventilation system, the system shall provide 



68 



2007 OREGON MECHANICAL SPECIALTY CODE 



COMBUSTION AIR 



the specified combustion/dilution air rate in addition to the 
required ventilation air. 



SECTION 707 
DIRECT CONNECTION 

707.1 General. Fuel-burning appliances that are listed and 
labeled for direct combustion air connection to the outdoors 
shall be installed in accordance with the manufacturer's instal- 
lation instructions. 



the louvers fail to open during burner startup and to shut 
down the main burner if the louvers close during operation. 

709.2 Dampered openings. Where the combustion air open- 
ings are provided with volume, smoke or fire dampers, the 
dampers shall be electrically interlocked with the firing cycle 
of the appliances served, so as to prevent operation of any 
appliance that draws combustion and dilution air from the 
room when any of the dampers are closed. Manually operated 
dampers shall not be installed in combustion air openings. 




SECTION 708 
COMBUSTION AIR DUCTS 

708.1 General. Combustion air ducts shall: 

1. Be of galvanized steel complying with Chapter 6 or of 
equivalent corrosion-resistant material approved for this 
application. 

Exception: Within dwelling units, unobstructed stud 
and joist spaces shall not be prohibited from convey- 
ing combustion air, provided that not more than one 
required fireblock is removed. 

2. Have a minimum cross-sectional dimension of 3 inches 
(76 mm). 

3. Terminate in an unobstructed space allowing free move- 
ment of combustion air to the appliances. 

4. Have the same cross-sectional areas as the free area of 
the openings to which they connect. 

5. Serve a single appliance enclosure. 

6. Not serve both upper and lower combustion air openings 
where both such openings are used. The separation 
between ducts serving upper and lower combustion air 
openings shall be maintained to the source of combus- 
tion air. 

7. Not be screened where terminating in an attic space. 

8. Not slope downward toward the source of combustion 
air, where serving the upper required combustion air 
opening. 



SECTION 710 
OPENING LOCATION AND PROTECTION 

710.1 General. Combustion air openings to the outdoors shall 
comply with the location and protection provisions of Sections 
401.4 and 401.5 applicable to outdoor air intake openings. 



SECTION 709 
OPENING OBSTRUCTIONS 

709.1 General. The required size of openings for combustion 
and dilution air shall be based on the net free area of each open- 
ing. The net free area of an opening shall be that specified by 
the manufacturer of the opening covering. In the absence of 
such information, openings covered with metal louvers shall be 
deemed to have a net free area of 75 percent of the area of the 
opening, and openings covered with wood louvers shall be 
deemed to have a net free area of 25 percent of the area of the 
opening. Louvers and grills shall be fixed in the open position. 

Exception: Louvers interlocked with the appliance so that 
they are proven to be in the full open position prior to main 
burner ignition and during main burner operation. Means 
shall be provided to prevent the main burner from igniting if 



2007 OREGON MECHANICAL SPECIALTY CODE 



69 



70 2007 OREGON WiECHANICAL SPECJALTY CODE 



CHAPTER 8 

CHIMNEYS AND VENTS 



SECTION 801 
GENERAL 

801.1 Scope. This chapter shall govern the installation, mainte- 
nance, repair and approval of factory-built chimneys, chimney 
liners, vents and connectors. This chapter shall also govern the 
utilization of masonry chimneys. Gas-fired appliances shall be 

I I vented in accordance with Appendix C. 

801.2 General. Every fuel-burning appliance shall discharge 
the products of combustion to a vent, factory-built chimney or 
masonry chimney, except for appliances vented in accordance 
with Section 804. The chimney or vent shall be designed for the 
type of appliance being vented. 

801.2.1 Oil-fired appliances. Oil-fired appliances shall be 
vented in accordance with this code and NFPA 31. 

801.3 Masonry chimneys. Masonry chimneys shall be con- 
structed in accordance with the Building Code. 

801.4 Positive flow. Venting systems shall be designed and 
constructed so as to develop a positive flow adequate to convey 
all combustion products to the outside atmosphere. 

801.5 Design. Venting systems shall be designed in accordance 
with this chapter or shall be approved engineered systems. 

801.6 Minimum size of chimney or vent. Except as otherwise 
provided for in this chapter, the size of the chimney or vent, 
serving a single appliance, except engineered systems, shall 
have a minimum area equal to the area of the appliance connec- 
tion. 



L.7 Solid fuel appliance flues. The cross-sectional area of a 
flue serving a solid fuel-burning appliance shall be not greater 
than three times the cross-sectional area of the appliance flue 
collar or flue outlet. 

801.8 Abandoned inlet openings. Abandoned inlet openings 
in chimneys and vents shall be closed by an approved method. 

801.9 Positive pressure. Where an appliance equipped with a 
forced or induced draft system creates a positive pressure in the 
venting system, the venting system shall be designed and listed 
for positive pressure applications. 

801.10 Connection to fireplace. Connection of appliances to 
chimney flues serving fireplaces shall be in accordance with 
Sections 801.10.1 through 801.10.3. 

801.10.1 Closure and access. A noncombustible seal shall 
be provided below the point of connection to prevent entry 
of room air into the flue. Means shall be provided for access 
to the flue for inspection and cleaning. 

801.10.2 Connection to factory-built fireplace flue. An 

appliance shall not be connected to a flue serving a fac- 
tory-built fireplace unless the appliance is specifically listed 
for such installation. The connection shall be made in accor- 
dance with the appliance manufacturer's installation 
instructions. 



801.10.3 Connection to masonry fireplace flue. A con- 
nector shall extend from the appliance to the flue serving a 
masonry fireplace such that the flue gases are exhausted 
directly into the flue. The connector shall be provided with 
access or shall be removable for inspection and cleaning of 
both the connector and the flue. Listed direct connection 
devices shall be installed in accordance with their listing. 

801.11 Multiple solid fuel prohibited. A solid fuel-burning 
appliance or fireplace shall not connect to a chimney passage- 
way venting another appliance. 

801.12 Chimney entrance. Connectors shall connect to a 
chimney flue at a point not less than 12 inches (305 mm) above 
the lowest portion of the interior of the chimney flue. 

801.13 Cleanouts. Masonry chimney flues shall be provided 
with a cleanout opening having a minimum height of 6 inches 
(152 mm). The upper edge of the opening shall be located not 
less than 6 inches (152 mm) below the lowest chimney inlet 
opening. The cleanout shall be provided with a tight-fitting, 
noncombustible cover. 

Exception: Cleanouts shall not be required for chimney 
flues serving masonry fireplaces, if such flues are provided 
with access through the fireplace opening. 

801.14 Connections to exhauster. All apphance connections 
to a chimney or vent equipped with a power exhauster shall be 
made on the inlet side of the exhauster. All joints and piping on 
the positive pressure side of the exhauster shall be listed for 
positive pressure applications as specified by the manufac- 
turer's installation instructions for the exhauster. 

801.15 Fuel-fired appliances. Masonry chimneys utilized to 
vent fuel-fired appliances shall be located, constructed and 
sized as specified in the manufacturer's installation instruc- 
tions for the appliances being vented. 

801.16 Flue lining. Masonry chimneys shall be lined. The lin- 
ing material shall be compatible with the type of appliance con- 
nected, in accordance with the appliance listing and 
manufacturer's installation instructions. Listed materials used 
as flue linings shall be installed in accordance with their hst- 
ings and the manufacturer's installation instructions. 

801.16.1 Residential and low-heat appliances (general). 

Flue lining systems for use with residential-type and 
low-heat appliances shall be limited to the following: 

1 . Clay flue lining complying with the requirements of 
ASTM C 315 or equivalent. Clay flue lining shall be 
installed in accordance with the Building Code. 

2. Listed chimney lining systems complying with UL 
1777. 

3. Other approved materials that will resist, without 
cracking, softening or corrosion, flue gases and con- 
densate at temperatures up to 1,800°F (982°C). 



2007 OREGON MECHANICAL SPECIALTY CODE 



71 



CHJWiNEYS AMD VENTS 



801.17 Space arounct liemg. The space surrounding a flue lin- 
ing system or other vent installed within a masonry chimney 
shall not be used to vent any other apphance. This shall not pre- 
vent the installation of a separate flue lining in accordance with 
the manufacturer's installation instructions and this code. 

8€)1.1§ Existimg chimneys aed vents. Where an appliance is 
permanently disconnected from an existing chimney or vent, or 
where an appliance is connected to an existing chimney or vent 
during the process of a new installation, the chimney or vent 
shall comply with Sections 801.18.1 through 801.18.4. 

801.18.1 Size. The chimney or vent shall be resized as nec- 
essary to control flue gas condensation in the interior of the 
chimney or vent and to provide the appliance or appliances 
served with the required draft. For the venting of oil-fired 
appliances to masonry chimneys, the resizing shall be in 
accordance with NFPA 3 1 . 



.18.2 Flee passageways. The flue gas passageway shall 
be free of obstructions and combustible deposits and shall 
be cleaned if previously used for venting a solid or liquid 
fuel-burning appliance or fireplace. The flue liner, chimney 
inner wall or vent inner wall shall be continuous and shall be 
free of cracks, gaps, perforations or other damage or deteri- 
oration which would allow the escape of combustion prod- 
ucts, including gases, moisture and creosote. Where an 
oil-fired appliance is connected to an existing masonry 
chimney, such chimney flue shall be repaired or relined in 
accordance with NFPA 3 1 . 

8(D1.18.3 Cleanout. Masonry chimneys shall be provided 
with a cleanout opening complying with Section 801.13. 



Chimneys and vents shall have 
air-space clearance to combustibles in accordance with the 
Building Code and the chimney or vent manufacturer's 
installation instructions. 

Exception; Masonry chimneys equipped with a chimney 
lining system tested and listed for installation in chimneys 
in contact with combustibles in accordance with UL 1777, 
and installed in accordance with the manufacturer's 
instructions, shall not be required to have clearance 
between combustible materials and exterior surfaces of 
the masonry chimney. Noncombustible fireblocking shall 
be provided in accordance with the Building Code. 

801.19 Meltistory prohitoited. Common venting systems for 
appliances located on more than one floor level shall be prohib- 
ited, except where all of the appliances served by the common 
vent are located in rooms or spaces that are accessed only from 
the outdoors. The appliance enclosures shall not communicate 
with the occupiable areas of the building. 

801.20 Plastic vent joints. Plastic pipe and fittings used to vent 
appliances shall be installed in accordance with the pipe manu- 
facturer's installation instructions and the appliance manufac- 
turer's installation instructions. Solvent cement joints between 
ABS pipe and fittings shall be cleaned. Solvent cement joints 
between CPVC and PVC pipe and fittings shall be primed. The 
primer shall be a contrasting color. 

Exception: Where compliance with this section would con- 
flict with the appliance manufacturer's installation instruc- 
tions. 



SECTION 802 
VENTS 

802.1 General. All vent systems shall be listed and labeled. 
Type L vents and pellet vents shall be tested in accordance with 
UL641. 

802.2 Vent application. The application of vents shall be in 
accordance with Table 802.2. 

TABLE 802.2 
VENT APPLICATION 



VENT TYPES 


APPLIANCE TYPES 


Type L oil vents 


Oil-burning appliances listed and labeled for 
venting with Type L vents; gas appliances 
listed and labeled for venting with Type B 
vents. 


Pellet vents 


Pellet fuel-burning appliances listed and 
labeled for venting with pellet vents. 



802.3 Installation. Vent systems shall be sized, installed and 
terminated in accordance with the vent and appliance manufac- 
turer's installation instructions. 

802.4 Vent termination caps required. Type L vents shall ter- 
minate with a listed and labeled cap in accordance with the vent 
manufacturer's installation instructions. 

802.5 Type L vent terminations. Type L vents shall terminate 
not less than 2 feet (610 mm) above the highest point of the roof 
penetration and not less than 2 feet (610 mm) higher than any 
portion of a building within 10 feet (3048 mm). 

802.6 Minimum vent heights. Vents shall terminate not less 
than 5 feet (1524 mm) in vertical height above the highest con- 
nected appliance flue collar. 

Exceptions: 

1. Venting systems of direct vent appliances shall be 
installed in accordance with the appliance and the 
vent manufacturer's instructions. 

2. Appliances listed for outdoor installations incorporat- 
ing integral venting means shall be installed in accor- 
dance with their listings and the manufacturer's 
installation instructions. 

3. Pellet vents shall be installed in accordance with the 
appliance and the vent manufacturer's installation 
instructions. 

802.7 Support of vents. All portions of vents shall be ade- 
quately supported for the design and weight of the materials 
employed. 

802.8 Insulation shield. Where vents pass through insulated 
assemblies, an insulation shield constructed of not less than 
No. 26 Gage sheet metal shall be installed to provide clearance 
between the vent and the insulation material. The clearance 
shall be not less than the clearance to combustibles specified by 
the vent manufacturer's installation instructions. Where vents 
pass through attic space, the shield shall terminate not less than 
2 inches (51 mm) above the insulation materials and shall be 
secured in place to prevent displacement. Insulation shields 
provided as part of a listed vent system shall be installed in 
accordance with the manufacturer's installation instructions. 



72 



2007 OREGON MECHANICAL SPECIALTY CODE 




SECTION 803 
CONNECTORS 

803.1 Connectors required. Connectors shall be used to con- 
nect appliances to the vertical chimney or vent, except where 
the chimney or vent is attached directly to the appliance. 

803.2 Location. Connectors shall be located entirely within the 
room in which the connecting appliance is located, except as pro- 
vided for in Section 803 . 1 0.4. Where passing through an unhealed 
space, a connector shall not be constructed of single-wall pipe. 

803.3 Size. The connector shall not be smaller than the size of 
the flue collar supplied by the manufacturer of the appliance. 
Where the appliance has more than one flue outlet, and in the 
absence of the manufacturer's specific instructions, the con- 
nector area shall be not less than the combined area of the flue 
outlets for which it acts as a common connector. 

803.4 Branch connections. All branch connections to the vent 
connector shall be made in accordance with the vent manufac- 
turer's instructions. 

803.5 Manual dampers. Manual dampers shall not be 
installed in connectors except in chimney connectors serving 
solid fuel-burning appliances. 

803.6 Automatic dampers. Automatic dampers shall be listed 
and labeled in accordance with UL 17 for oil-fired heating 
appliances. The dampers shall be installed in accordance with 
the manufacturer's installation instructions. An automatic vent 
damper device shall not be installed on an existing appliance 
unless the appliance is listed and labeled and the device is 
installed in accordance with the terms of its listing. The name 
of the installer and date of installation shall be marked on a 
label affixed to the damper device. 

803.7 Connectors serving two or more appliances. Where 
two or more connectors enter a common vent or chimney, the 
smaller connector shall enter at the highest level consistent 
with available headroom or clearance to combustible material. 

803.8 Vent connector construction. Vent connectors shall be 
constructed of metal. The minimum nominal thickness of the 
connector shall be 0.019 inch (0.5 mm) (No. 28 Gage) for galva- 
nized steel, 0.022 inch (0.6 mm) (No. 26 B & S Gage) for copper, 
and 0.020 inch (0.5 mm) (No. 24 B & S Gage) for aluminum. 

803.9 Chimney connector construction. Chimney connec- 
tors for low-heat appliances shall be of sheet steel pipe having 
resistance to corrosion and heat not less than that of galvanized 
steel specified in Table 803.9(1). Connectors for medium-heat 
appliances and high-heat appliances shall be of sheet steel not 
less than the thickness specified in Table 803.9(2). 

TABLE 803.9(1) 

MINIMUM CHIMNEY CONNECTOR THICKNESS FOR 

LOW-HEAT APPLIANCES 



DIAMETER OF CONNECTOR 
(inches) 


MINIMUM NOMINAL THICKNESS 
(galvanized) (inches) 


5 and smaller 


0.022 (No. 26 Gage) 


Larger than 5 and up to 10 


0.028 (No. 24 Gage) 


Larger than 10 and up to 16 


0.034 (No. 22 Gage) 


Larger than 16 


0.064 (No. 16 Gage) 



CHIMNEYS AND VENTS 



TABLE 803.9(2) 

MINIMUM CHIMNEY CONNECTOR THICKNESS FOR 

MEDIUM- AND HIGH-HEAT APPLIANCES 



AREA 
(square inches) 


EQUIVALENT ROUND 

DIAMETER 

(inches) 


MINIMUM NOMINAL 

THICKNESS 

(inches) 


0-154 


0-14 


0.060 (No. 16 Gage) 


155-201 


15-16 


0.075 (No. 14 Gage) 


202-254 


17-18 


0.105 (No. 12 Gage) 


Greater than 254 


Greater than 18 


0.135 (No. 10 Gage) 



For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mnf . 

803.10 Installation. Connectors shall be installed in accor- 
dance with Sections 803.10.1 through 803.10.6. 

803.10.1 Supports and joints. Connectors shall be sup- 
ported in an approved manner, and joints shall be fas- 
tened with sheet metal screws, rivets or other approved 
means. 

803.10.2 Length. The maximum horizontal length of a sin- 
gle-wall connector shall be 75 percent of the height of the 
chimney or vent. 

803.10.3 Connection. The connector shall extend to the 
inner face of the chimney or vent liner, but not beyond. A 
connector entering a masonry chimney shall be cemented to 
masonry in an approved manner. Where thimbles are 
installed to facilitate removal of the connector from the 
masonry chimney, the thimble shall be permanently 
cemented in place with high-temperature cement. 

803.10.4 Connector pass-through. Chimney connectors 
shall not pass through any floor or ceiling, nor through a 
fire-resistance-rated wall assembly. Chimney connectors 
for domestic-type appliances shall not pass through walls or 
partitions constructed of combustible material to reach a 
masonry chimney unless: 

1 . The connector is labeled for wall pass-through and is 
installed in accordance with the manufacturer's 
instructions; 

2. The connector is put through a device labeled for wall 
pass-through; or 

3. The connector has a diameter not larger than 10 
inches (254 mm) and is installed in accordance with 
one of the methods in Table 803.10.4. Concealed 
metal parts of the pass-through system in contact with 
flue gases shall be of stainless steel or equivalent 
material that resists corrosion, softening or cracking 
uptol,800°F(980°C). 

803.10.5 Pitch. Connectors shall rise vertically to the 
chimney or vent with a minimum pitch equal to 
one-fourth unit vertical in 12 units horizontal (2-percent 
slope). 



For SI: 1 inch = 25.4 mm. 



2007 OREGON MECHANICAL SPECIALTY CODE 



73 



CHIMNEYS AND VENTS 



TABLE 803.10.4 

CHIfVJNEY CONNECTOR SYSTEMS AND CLEARANCES 

TO COMBUSTIBLE WALL MATERIALS FOR 

DOMESTIC HEATING APPLIANCES^"'''' 



System A 
(12-inch clearance) 


A 3.5-inch-thick brick wall shall be framed 
into the combustible wall. A 0.625 -inch-thick 
fire-clay Hner (ASTM C 315 or equivalent)* 
shall be firmly cemented in the center of the 
brick wall maintaining a 12-inch clearance to 
combustibles. The clay liner shall run from 
the outer surface of the bricks to the inner 
surface of the chimney liner. 


System B 
(9-inch clearance) 


A labeled solid-insulated factory-built chimney 
section (1-inch insulation) the same inside 
diameter as the connector shall be utilized. 
Sheet metal supports cut to maintain a 9-inch 
clearance to combustibles shall be fastened to 
the wall surface and to the chimney section. 
Fasteners shall not penetrate the chimney flue 
liner. The chimney length shall be flush with 
the masonry chimney liner and sealed to the 
masonry with water- insoluble refractory 
cement. Chimney manufacturers' parts shall be 
utilized to securely fasten the chimney 
connector to the chimney section. 


System C 
(6-inch clearance) 


A sheet metal (minimum number 24 Gage) 
ventilated thimble having two 1-inch air 
channels shall be installed with a sheet steel 
chimney connector (minimum number 24 
Gage). Sheet steel supports (minimum number 
24 Gage) shall be cut to maintain a 6-inch 
clearance between the thimble and 
combustibles. One side of the support shall be 
fastened to the wall on all sides. Glass-fiber 
insulation shall fill the 6-inch space between 
the thimble and the supports. 


System D 
(2-inch clearance) 


A labeled solid-insulated factory-built chimney 
section (1-inch insulation) with a diameter 2 
inches larger than the chimney connector shall 
be installed with a sheet steel chimney 
connector (minimum number 24 Gage). Sheet 
metal supports shall be positioned to maintain 
a 2-inch clearance to combustibles and to hold 
the chimney connector to ensure that a 1-inch 
airspace surrounds the chimney connector 
through the chimney section. The steel support 
shall be fastened to the wall on all sides and the 
chimney section shall be fastened to the 
supports. Fasteners shall not penetrate the liner 
of the chimney section. 



For SI: 1 inch = 25.4 mm, 1 .0 Btu x in/ft^ » h » °F = 0. 144 W/m^ " K. 

a. Insulation material that is part of the wall pass-through system shall be 
noncombustible and shall have a thermal conductivity of 1 .0 Btu x in/ft^ "h" 
°F or less. 

b. All clearances and thicknesses are minimums. 

c. Materials utilized to seal penetrations for the connector shall be 
noncombustible. 

d. Connectors for all systems except System B shall extend through the wall 
pass-through system to the inner face of the flue liner. 

e. ASTM C 315. 



803.1(1).6 Clearances. Connectors shall have a minimum 
clearance to combustibles in accordance with Table 803 .10.6. 
The clearances specified in Table 803.10.6 apply, except 
where the listing and labeling of an apphance specifies a dif- 
ferent clearance, in which case the labeled clearance shall 
apply. The clearance to combustibles for connectors shall be 
reduced only in accordance with Section 308. 

TABLE 803.10.6 
CONNECTOR CLEARANCES TO COMBUSTIBLES 



TYPE OF APPLIANCE 


MINIMUM CLEARANCE 
(Inches) 


Domestic-type appliances 


Chimney and vent connectors 
Electric and oil incinerators 
Oil and solid fuel appliances 
Oil appliances labeled for venting 
with Type L vents 


18 
18 
9 


Commercial, industrial-type appliances 


Low-heat appliances 
Chimney connectors 

Oil and solid fuel boilers, furnaces 
and water heaters 

Oil unit heaters 

Other low-heat industrial appliances 


18 

18 
18 


Medium-heat appliances 
Chimney connectors 
All oil arid solid fuel appUances 


36 


High-heat appliances 
Masonry or metal connectors 
All oil and solid fuel appliances 


(As determined by the 
code official) 



For SI: 1 inch = 25.4 mm. 



SECTION 804 

DIRECT-VENT, INTEGRAL VENT AND 

MECHANICAL DRAFT SYSTEI\fflS 

804.1 Direct-vent termmatioms. Vent terminals for 
direct- vent appliances shall be installed in accordance with the 
manufacturer's installation instructions 

804o2 Appliances with integral vents. Appliances incorporat- 
ing integral venting means shall be installed in accordance with 
their listings and the manufacturer's installation instructions. 



11.2.1 Terminal clearances. Appliances designed for nat- 
ural draft venting and incorporating integral venting means 
shall be located so that a minimum clearance of 9 inches 
(229 mm) is maintained between vent terminals and from 
any openings through which combustion products enter the 
building. Appliances using forced draft venting shall be 
located so that a minimum clearance of 12 inches (305 mm) 
is maintained between vent terminals and from any open- 
ings through which combustion products enter the building. 



74 



2007 OREGON MECHANICAL SPECIALTY CODE 



CHIMNEYS AND VENTS 



804.3 Mechanical draft systems. ^Mechanical draft systems of 
either forced or induced draft design shall comply with Sec- 
tions 804.3.1 through 804.3.7. ! 

804.3.1 Forced draft systems. Forced draft systems and all 
portions of induced draft systehis under positive pressure 
during operation shall be designed and installed so as to be 
gas tight to prevent leakage of combustion products into a 
building. 

804.3.2 Automatic shutoff. Power exhausters serving auto- 
matically fired appliances shall be electrically connected to 
each appliance to prevent operation of the appliance when 
the power exhauster is not in operation. 

804.3.3 Termination. The termination of chimneys or vents 
equipped with power exhausters shall be located a minimum 
of 10 feet (3048 mm) from the lot line or from adjacent 
buildings. The exhaust shall be directed away from the 
building. 

804.3.4 Horizontal terminations. Horizontal terminations 
shall comply with the following requirements: 

1. Where located adjacent to walkways, the termination 
of mechanical draft systems shalTbe not less than 7 
feet (2134 mm) above the level of the walkway. 

2. Vents shall terminate at least 3 feet (914 mm) above 
any forced air inlet located within 1 feet (3 048 mm) . 

3. The vent system shall terminate at least 4 feet (1219 
mm) below, 4 feet (1219 mm) horizontally from or 1 
foot (305 mm) above any door, window or gravity air 
inlet into the building. 

4. The vent termination point shall not be located closer 
than 3 feet (914 mm) to an interior corner formed by 
two walls perpendicular to each other. 

5. The vent termination shall not be mounted directly 
above or within 3 feet (914 mm) horizontally from an 
oil tank vent or gas meter. 

6. The bottom of the vent termination shall be located at 
least 12 inches (305 mm) above finished grade. 



1.3.5 Vertical terminations. Vertical terminations shall 
comply with the following requirements: 

1. Where located adjacent to walkways, the termination 
of mechanical draft systems shall be not less than 7 
feet (2134 mm) above the level of the walkway. 

2. Vents shall terminate at least 3 feet (914 mm) above 
any forced air inlet located within 10 feet (3048 mm) 
horizontally. 

3. Where the vent termination is located below an adja- 
cent roof structure, the termination point shall be 
located at least 3 feet (914 mm) from such structure. 

4. The vent shall terminate at least 4 feet (1219 mm) 
below, 4 feet (1219 mm) horizontally from or 1 foot 
(305 mm) above any door, window or gravity air inlet 
for the building. 

5. A vent cap shall be installed to prevent rain from 
entering the vent system. 



6. The vent termination shall be located at least 3 feet 
(914 mm) horizontally from any portion of the roof 
structure. 

804.3.6 Exhauster connections. An appliance vented by 
natural draft shall not be connected into a vent, chimney or 
vent connector on the discharge side of a mechanical flue 

exhauster. 

804.3.7 Exhauster sizing. Mechanical flue exhausters and 
the vent system served shall be sized and installed in accor- 
dance with the manufacturer's installation instructions. 

804.3.8 Mechanical draft systems for manually fired 
appUances and fireplaces. A mechanical draft system shall 
be permitted to be used with manually fired appliances and 
fireplaces where such system complies with all of the fol- 
lowing requirements: 

1. The mechanical draft device shall be listed and 
installed in accordance with the manufacturer's 
installation instructions. 

2. A device shall be installed that produces visible and 
audible warning upon failure of the mechanical draft 
device or loss of electrical power, at any time that the 
mechanical draft device is turned on. This device 
shall be equipped with a battery backup if it receives 
power from the building wiring. 

3. A smoke detector shall be installed in the room with 
the appliance or fireplace. This device shall be 
equipped with a battery backup if it receives power 
from the building wiring. 



SECTION 805 
FACTORY-BUILT CHIMNEYS 

805.1 Listing. Factory-built chimneys shall be listed and 
labeled and shall be installed and terminated in accordance 
with the manufacturer's installation instructions. 

805.2 Solid fuel appliances. Factory-built chinmeys installed 
in dwelling units with solid fuel-burning appliances shall com- 
ply with the Type HT requirements of UL 103 and shall be 
marked "Type HT" and "Residential Type and Building Heat- 
ing Appliance Chimney." 

Exceptions: 

1. Chimneys for use with open combustion chamber 
fireplaces shall comply with the requirements of UL 
103 and shall be marked "Residential Type and 
Building Heating Appliance Chimney." 

2. Chimneys for use with open combustion chamber 
appliances installed in buildings other than dwelling 
units shall comply with the requirements of UL 103 
and shall be marked "Building Heating Appliance 
Chimney" or "Residential Type and Building Heating 
Appliance Chimney." 

805.3 Factory-built fireplaces. Chimneys for use with fac- 
tory-built fireplaces shall comply with the requirements of UL 

127. 



2007 OREGON MECHANICAL SPECIALTY CODE 



75 



CHIMMEYS AND VENTS 



MBA Support. Where factory-built chimneys are supported 
by structural members, such as joists and rafters, such mem- 
bers shall be designed to support the additional load. 

8(0)5.5 Mediinm-Itieat appMaeces. Factory-built chimneys for 
medium-heat appliances producing flue gases having a tem- 
perature above 1,000°F (538°C), measured at the entrance to 
the chimney, shall comply with UL 959. 

§05,6 Becorative sliroeds. Decorative shrouds shall not be 
installed at the termination of factory-built chimneys except 
where such shrouds are listed and labeled for use with the spe- 
cific factory-built chimney system and are installed in accor- 
dance with Section 304.1. 



8(06.1 Geeeral. Metal chimneys shall be constructed and 
installed in accordance with NFPA 211. 



76 2007 OREGON MECHANICAL SPECIALTY CODE 



CHAPTER 9 

SPECIFIC APPLIANCES, FIREPLACES AND 
SOLID FUEL-BURNING EQUIPMENT 



SECTION 901 
GENERAL 

901.1 Scope. This chapter shall govern the approval, design, 
^ installation, construction, alteration and repair of the appli- 
ances and equipment specifically identified herein and fac- 
tory-built fireplaces. The approval, design, installation, 

^ construction, alteration and repair of gas-fired appliances shall 
I I be regulated by Appendix C. 

901.2 General. The requirements of this chapter shall apply to 
the mechanical equipment and appliances regulated by this 
chapter, in addition to the other requirements of this code. 

901.3 Hazardous locations. Fireplaces and solid fuel-burning 
appliances shall not be installed in hazardous locations. 



L.4 Fireplace accessories. Listed fireplace accessories shall 
be installed in accordance with the conditions of the listing and 
the manufacturer's installation instructions. 



SECTION 902 
MASONRY FIREPLACES 

E.l General. Masonry fireplaces shall be constructed in 
accordance with the Building Code. 



SECTION 905 
FIREPLACE STOVES AND ROOM HEATERS 

905.1 General. Fireplace stoves and solid-fuel-type room 
heaters shall be listed and labeled and shall be installed in 
accordance with the conditions of the listing. Fireplace stoves 
shall be tested in accordance with UL 737. Solid-fuel-type 
room heaters shall be tested in accordance with UL 1482. Fire- 
place inserts intended for installation in fireplaces shall be 
listed and labeled in accordance with the requirements of UL 
1482 and shall be installed in accordance with the manufac- 
turer's installation instructions. 

905.2 Connection to fireplace. The connection of solid fuel 
appliances to chimney flues serving fireplaces shall comply 
with Sections 801.7 and 801.10. 



SECTION 906 
FACTORY-BUILT BARBECUE APPLIANCES 

906.1 General. Factory-built barbecue appliances shall be of 
an approved type and shall be installed in accordance with the 
manufacturer's installation instructions, this chapter and Chap- 
ters 3, 5, 7, 8 and Appendix C. I I 



SECTION 903 
FACTORY-BUILT FIREPLACES 

kl General. Factory-built fireplaces shall be listed and 
labeled and shall be installed in accordance with the conditions 
of the listing. Factory-built fireplaces shall be tested in accor- 
dance with UL 127. 



.2 Hearth extensions. Hearth extensions of approved fac- 
tory-built fireplaces and fireplace stoves shall be installed in 
accordance with the listing of the fireplace. The hearth exten- 
sion shall be readily distinguishable from the surrounding floor 
area. 



.3 Unvented gas log heaters. An unvented gas log heater 
shall not be installed in a factory-built fireplace unless the fire- 
place system has been specifically tested, listed and labeled for 
such use in accordance with UL 127. 



SECTION 904 
PELLET FUEL-BURNING APPLIANCES 

1.1 General. Pellet fuel-burning appliances shall be listed 
and labeled in accordance with ASTM E 1509 and shall be 
installed in accordance with the terms of the listing. 



SECTION 907 
INCINERATORS AND CREMATORIES 

907.1 General. Incinerators and crematories shall be listed and 
labeled and shall be installed in accordance with the manufac- < 
turer's installation instructions. 



SECTION 908 

COOLING TOWERS, EVAPORATIVE 

CONDENSERS AND FLUID COOLERS 

908.1 General. A cooHng tower used in conjunction with an 
air-conditioning appliance shall be installed in accordance 
with the manufacturer's installation instructions. 

908.2 Access. Cooling towers, evaporative condensers and 
fluid coolers shall be provided with ready access. 

908.3 Location. Cooling towers, evaporative condensers and 
fluid coolers shall be located to prevent the discharge vapor 
plumes from entering occupied spaces. Plume discharges shall 
be not less than 5 feet (1524 mm) above or 20 feet (6096 nmi) 
away from any ventilation inlet to a building. Location on the 
property shall be as required for buildings in accordance with 
the Building Code. 



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> 



908.4 Support amdl amdnorage. Supports for cooling towers, 
evaporative condensers and fluid coolers shall be designed in 
accordance with the Building Code. Seismic restraints shall be 
as required by the Building Code. 



^. Water supplies and protection shall be as 
required by the Plumbing Code. 



ige. Drains, overflows and blowdown provisions 
shall be indirectly connected to an approved disposal location. 
Discharge of chemical waste shall be approved by the appro- 
priate regulatory authority. 



VEMTED WALL FURNACES 

9©9.1 GeeeraL Vented wall furnaces shall be installed in 
accordance with their listing and the manufacturer's installa- 
tion instructions. Oil-fired furnaces shall be tested in accor- 
dance with UL 730. 



Ji.2 Locattnom. Vented wall furnaces shall be located so as not 
to cause a fire hazard to walls, floors, combustible furnishings 
or doors. Vented wall furnaces installed between bathrooms 
and adjoining rooms shall not circulate air from bathrooms to 
other parts of the building. 



3 Door swing. Vented wall furnaces shall be located so 
that a door cannot swing within 12 inches (305 mm) of an air 
inlet or air outlet of such furnace measured at right angles to the 
opening. Doorstops or door closers shall not be installed to 
obtain this clearance. 



^A Beets prohibited. Ducts shall not be attached to wall 
furnaces. Casing extension boots shall not be installed unless 
listed as part of the appliance. 



' valve. A manual shutoff valve shall be 
installed ahead of all controls. 



.6 Access. Vented wall furnaces shall be provided with 
access for cleaning of heating surfaces, removal of burners, 
replacement of sections, motors, controls, filters and other 
working parts, and for adjustments and lubrication of parts 
requiring such attention. Panels, grilles and access doors that 
must be removed for normal servicing operations shall not be 
attached to the building construction. 



The furnace shall be placed such that a drapery or similar' 
combustible object will not be nearer than 12 inches (305 mm) 
to any portion of the register of the furnace. Floor furnaces shall 
not be installed in concrete floor construction built on grade. 
The controlling thermostat for a floor furnace shall be located 
within the same room or space as the floor furnace or shall be 
located in an adjacent room or space that is permanently open 
to the room or space containing the floor furnace. 



).3 Bracing. The floor around the furnace shall be braced 
and headed with a support framework design in accordance 
with the Building Code. 



A Clearance. The lowest portion of the floor furnace shall 
have not less than a 6-inch (152 mm) clearance from the grade 
level; except where the lower 6-inch (152 mm) portion of the 
floor furnace is sealed by the manufacturer to prevent entrance 
of water, the minimum clearance shall be reduced to not less 
than 2 inches (5 1 mm). Where these clearances are not present, 
the ground below and to the sides shall be excavated to form a 
pit under the furnace so that the required clearance is provided 
beneath the lowest portion of the furnace. A 12-inch (305 mm) 
minimum clearance shall be provided on all sides except the 
control side, which shall have an 18-inch (457 mm) minimum 
clearance. 



SECTI0M911 
DUCT FURNACES 

911.1 General. Duct furnaces shall be installed in accordance 
with the manufacturer's installation instructions. Electric fur- 
naces shall be tested in accordance with UL 1995. 



SECTION 912 
INFRARED RADIANT HEATERS 

912.1 Support. Infrared radiant heaters shall be fixed in a 
position independent of fuel and electric supply lines. Hangers 
and brackets shall be noncombustible material. 

912.2 Clearances. Heaters shall be installed with clearances 
from combustible material in accordance with the manufac- 
turer's installation instructions. 



FLOOR FURNACES 

D.l General. Floor furnaces shall be installed in accordance 
with their listing and the manufacturer's installation instruc- 
tions. Oil-fired furnaces shall be tested in accordance with UL 
729. 



Floor furnaces shall not be installed in the 
floor of any aisle or passageway of any auditorium, public hall, 
place of assembly, or in any egress element from any such room 
or space. 

With the exception of wall register models, a floor furnace 
shall not be placed closer than 6 inches (152 mm) to the nearest 
wall, and wall register models shall not be placed closer than 6 
inches (152 mm) to a corner. 



SECTION 913 
CLOTHES DRYERS 

913.1 General. Clothes dryers shall be installed in accordance 
with the manufacturer's installation instmctions. Electric resi- 
dential clothes dryers shall be tested in accordance with an 
approved test standard. Electric commercial clothes dryers 
shall be tested in accordance with UL 1240. Electric coin-oper- 
ated clothes dryers shall be tested in accordance with UL 2158. 



required. Clothes dryers shall be exhausted in 
accordance with Section 504. 

913.3 Clearances. Clothes dryers shall be installed with clear- 
ance to combustibles in accordance with the manufacturer's 
instructions. 



78 



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SECTION 914 
SAUNA HEATERS 

914.1 Location and protection. Sauna heaters shall be located 
so as to minimize the possibility of accidental contact by a per- 
son in the room. 

914.1.1 Guards. Sauna heaters shall be protected from 
accidental contact by an approved guard or barrier of mate- 
rial having a low coefficient of thermal conductivity. The 
guard shall not substantially affect the transfer of heat from 
the heater to the room. 

914.2 Installation. Sauna heaters shall be listed and labeled 
and shall be installed in accordance with their listing and the 
manufacturer's installation instructions. 

914.3 Access. Panels, grilles and aqcess doors that are required 
to be removed for normal servicing operations shall not be 
attached to the building. 

914.4 Heat and time controls. Sauna heaters shall be equipped 
with a thermostat that will Umit room temperature to 194°F 
(90°C). If the thermostat is not an integral part of the sauna 
heater, the heat-sensing element shall be located within 6 inches 
(152 mm) of the ceiling. If the heat-sensing element is a capillary 
tube and bulb, the assembly shall be attached to the wall or other 
support, and shall be protected against physical damage. 

914.4.1 Timers. A timer, if provided to control main burner 
operation, shall have a maximum operating time of 1 hour. 
The control for the timer shall be located outside the sauna 
room. 

914.5 Sauna room. A ventilation opening into the sauna room 
shall be provided. The opening shall be not less than 4 inches 
by 8 inches (102 mm by 203 mm) located near the top of the 
door into the sauna room. 

914.5.1 Warning notice. The following permanent notice, 
constructed of approved material, shall be mechanically 
attached to the sauna room on the outside: 

WARNING: DO NOT EXCEED 30 MINUTES IN 
SAUNA. EXCESSIVE EXPOSURE CAN BE HARM- 
FUL TO HEALTH. ANY PERSON WITH POOR 
HEALTH SHOULD CONSULT A PHYSICIAN 
BEFORE USING SAUNA. 

The words shaU contrast with the background and the word- 
ing shall be in letters not less than 0.25-inch (6.4 mm) high. 

Exception: This section shall not apply to one- and 
two-family dwellings. 



SECTION 915 

ENGINE AND GAS TURBINE-POWERED 

EQUIPMENT AND APPLIANCES 

915.1 General. The installation of hquid-fueled stationary 
internal combustion engines and gas turbines, including fuel 
storage and piping, shall meet the requirements of NFPA 37. 

915.2 Powered equipment and appliances. Permanendy 
installed equipment and appliances powered by internal com- 
bustion engines and turbines shall be installed in accordance 
with the manufacturer's installation instructions and NFPA 37. 



SECTION 916 
POOL AND SPA HEATERS 

916.1 General. Pool and spa heaters shall be installed in accor- 
dance with the manufacturer's installation instructions. 
Oil-fired pool and spa heaters shall be tested in accordance 
with UL 726. Electric pool and spa heaters shall be tested in 
accordance with UL 1261. 



SECTION 917 
COOKING APPLIANCES 

917.1 Cooking appliances. Cooking appliances that are 
designed for permanent installation, including ranges, ovens, 
stoves, broilers, grills, fryers, griddles and barbecues, shall be 
listed, labeled and installed in accordance with the manufac- 
turer's installation instructions. Oil-burning stoves shall be 
tested in accordance with UL 896. Solid fuel-fired ovens shall 
be tested in accordance with UL 2162. 

917.2 Prohibited location. Cooking apphances designed, 
tested, listed and labeled for use in commercial occupancies 
shall not be installed within dwelling units or within any area 
where domestic cooking operations occur. 

917.3 Domestic appliances. Cooking appliances installed 
within dwelling units and within areas where domestic cooking 
operations occur shall be hsted and labeled as household-type 
appliances for domestic use 

917.4 Installation of a listed cooking appliance or micro- 
wave over a listed cooking top appliance. The installation of 
a listed cooking appliance or microwave oven over a listed 
cooking top appliance shall conform to the conditions of the 
upper appliance's listing and the manufacturer's installation 
instructions. 



SECTION 918 
FORCED-AIR WARM-AIR FURNACES 

918.1 Forced-air furnaces. Oil-fired furnaces shall be tested 
in accordance with UL 727. Electric furnaces shall be tested in 
accordance with UL 1995. Solid fuel furnaces shall be tested in 
accordance with UL 391 . Forced-air furnaces shall be installed 
in accordance with the listings and the manufacturer's installa- 
tion instructions. 

918.2 Minimum duct sizes. The minimum unobstructed total 
area of the outdoor and return air ducts or openings to a 
forced-air warm-air furnace shall be not less than 2 square 
inches per 1,000 Btu/h (4402 mm^/kW) output rating capacity 
of the furnace and not less than that specified in the furnace 
manufacturer's installation instructions. The minimum unob- 
structed total area of supply ducts from a forced-air warm-air 
furnace shall not be less than 2 square inches for each 1,000 
Btu/h (4402 mm^/kW) output rating capacity of the furnace 
and not less than that specified in the furnace manufacturer's 
installation instructions. 

Exception: The total area of the supply air ducts and out- 
door and return air ducts shall not be required to be larger 
than the minimum size required by the furnace manufac- 
turer's installation instructions. 



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The minimum unobstructed total area of 
I the outdoor and return air ducts or openings to a heat pump 
shall be not less than 6 square inches per 1,000 Btu/h (13 208 
mm^/kW) output rating or as indicated by the conditions of list- 
ing of the heat pump. Electric heat pumps shall be tested in 
accordance with UL 1995. 

918.4 Dampers. Volume dampers shall not be placed in the air 
inlet to a furnace in a manner that will reduce the required air to 
the furnace. 

918.5 Circulating air ducts for forced-air warm-air fur- 
naces. Circulating air for fuel-burning, forced-air-type, 
warm-air furnaces shall be conducted into the blower housing 
from outside the furnace enclosure by continuous air-tight 
ducts. 

I 918.6 Prohibited sources. Outdoor or return air for a 
forced-air heating system shall not be taken from the following 
locations: 

1. Closer than 10 feet (3048 mm) from an appliance vent 
outlet, a vent opening from a plumbing drainage system 

I or the discharge outlet of an exhaust fan, unless the outlet 

is 3 feet (914 mm) above the outdoor air inlet. 

2. Where there is the presence of objectionable odors, 
fumes or flammable vapors; or where located less than 
10 feet (3048 mm) above the surface of any abutting pub- 
lic way or driveway; or where located at grade level by a 
sidewalk, street, alley or driveway. 

I Exception: Listed outdoor appliances which provide 

' both circulating air inlet and vent discharge. 

3. A hazardous or insanitary location or a refrigeration 
machinery room as defined in this code. 

4. A room or space, the volume of which is less than 25 per- 
cent of the entire volume served by such system. Where 
connected by a permanent opening having an area sized 
in accordance with Sections 918.2 and 918.3, adjoining 
rooms or spaces shall be considered as a single room or 
space for the purpose of determining the volume of such 
rooms or spaces. 

Exception: The minimum volume requirement shall 
not apply where the amount of return air taken from a 
room or space is less than or equal to the amount of 
supply air delivered to such room or space. 

5. A closet, bathroom, toilet room, kitchen, garage, 
mechanical room, boiler room or furnace room. 

6. A room or space containing a fuel-burning appliance 
where such room or space serves as the sole source of 
return air. 



This shall not apply where the fuel-burning 
appliance is a direct- vent appliance. 

This shall not apply where the room or space 
complies with the following requirements: 

2. 1 . The return air shall be taken from a room or 
space having a volume exceeding 1 cubic 
foot for each 10 Btu/h (9.6 LAV) of com- 



bined input rating of all fuel-burning 
appliances therein. 

2.2. The volume of supply aii' discharged back 
into the same space shall be approximately 
equal to the volume of return air taken from 
the space. 

2.3. Return-air inlets shall not be located within 
10 feet (3048 mm) of any appliance firebox 
or draft hood in the same room or space. 

3. This shall not apply to rooms or spaces contain- 
ing solid fuel-burning appliances, provided that 
return-air inlets are located not less than 10 feet 
(3048 mm) from the firebox of such appUances. 

918.7 Outside opening protection. Outdoor air intake open- 
ings shall be protected in accordance with Section 401.5. 

918.8 Return-air limitation. Return air from one dwelling 
unit shall not be discharged into another dwelling unit. 



SECTION 919 
CONVERSION BURNERS 

919.1 Conversion burners. The installation of conversion 
burners shall conform to ANSI Z21.8. 



SECTION 920 
UNIT HEATERS 

920.1 General, Unit heaters shall be installed in accordance 
with the listing and the manufacturer's installation instructions. 
Oil-fired unit heaters shall be tested in accordance with UL 

731. 

920.2 Support. Suspended-type unit heaters shall be sup- 
ported by elements that are designed and constructed to accom- 
modate the weight and dynamic loads. Hangers and brackets 
shall be of noncombustible material. Suspended-type oil-fired 
unit heaters shall be installed in accordance with NFPA 31. 

920.3 Ductwork. A unit heater shall not be attached to a 
warm-air duct system unless listed for such installation. 



SECTION 921 
VENTED ROOM HEATERS 

921.1 General. Vented room heaters shall be listed and labeled 
and shall be installed in accordance with the conditions of the 
listing and the manufacturer's instructions. 



SECTION 922 
KEROSENE AND OIL-FIRED STOVES 

922.1 General. Kerosene and oil-fired stoves shall be listed 
and labeled and shall be installed in accordance with the condi- 
tions of the listing and the manufacturer's installation instruc- 
tions. Kerosene and oil-fired stoves shall comply with NFPA 
3 1 . Oil-fired stoves shall be tested in accordance with UL 896. 



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II 



II 



SECTION 923 
SMALL CERAMIC KILNS 

923.1 General. The provisions of this section shall apply to 
listed and unlisted kilns that are used for ceramics, have a maxi- 
mum interior volume of 20 cubic feet (0.566 m^) and are used 
for hobby and noncommercial purposes. 

923.1.1 Installation. Listed kilns shall be installed in accor- 
dance with the manufacturer's installation instructions and 
the provisions of this code. 

923.2 Unlisted kiln installation. Unlisted kilns shall be 
installed in accordance with the manufacturer's installation 
instructions and the provisions of this code. 

923.2.1 Installations inside buildings. In addition to other 
requirements specified in this section, interior installation 
shall meet the following requirements: 

923.2.2 Clearances for interior installation. The sides and 
tops of kilns shall be located a minimum of 18 inches (457 
mm) from any noncombustible wall surface and 3 feet (914 
mm) from any combustible wall surface. Kilns shall be 
installed on noncombustible flooring, consisting of at least 2 
inches (5 1 mm) of solid masonry or concrete extending at 
least 12 inches (305 mm) beyond the base or supporting 
members of the kiln. 

Exception: These clearances may be reduced, provided 
independent testing is provided to and approved by the 
building official. 

923.2.3 Control side clearance. The clearance on the con- 
trol side of a kiln shall not be reduced to less than 30 inches 
(762 mm). 

923.2.4 Hoods. A canopy-type hood shall be installed 
directly above each kiln. The face opening area of the hood 
shall be equal to or greater than the top horizontal surface 
area of the kiln. The hood shall be constructed of not less 
than 0.030-inch (0.76 mm) (No. 22 U.S. gage) galvanized 
steel or equivalent and be supported at a height of between 
12 inches and 30 inches (305 mm and 762 mm) above the 
kiln by noncombustible supports. 

Exception: Electric kilns installed with listed exhaust 
blowers may be used when marked as being suitable for 
the kiln and installed in accordance with manufacturer's 
instructions. 

923.2.5 Gravity ventilation ducts. Each kiln hood shall be 
connected to a gravity ventilation duct extending in a verti- 
cal direction to outside the building. This duct shall be of the 
same construction as the hood and shall have a cross-sec- 
tional area of not less than one-fifteenth of the face opening 
of the hood. The duct shall terminate a minimum of 12 
inches (305 mm) above any portion of a building within 4 
feet (1219 mm) and terminate no less than 4 feet (1219 mm) 
from any openable windows or other opening into the build- 
ing or adjacent property line. The duct to the outside shall be 
shielded, without reduction of duct area, to prevent entrance 
of rain into the duct. The duct shall be supported at each sec- 
tion by noncombustible supports. 

923.2.6 Hood and duct clearances. Every hood and duct 
serving a fuel-burning kiln shall have a clearance from com- 



bustible construction of at least 18 inches (457 mm). This 
clearance may be reduced in accordance with Table 308.6. 

923.2.6.1 Makeup air. Provisions shall be made for air to 
enter the room in which a kiln is installed at a rate at least 
equal to the air being removed through the kiln hood. 

923.3 Exterior installations. Kilns shall be installed with min- 
imum clearances as specified in Section 923.2.2. Kilns located 
under a roof and enclosed by two or more vertical wall surfaces 
shall have a hood and gravity ventilation duct installed to com- 
ply with Sections 923.2.4 and 923.2.5. 

SECTION 924 
STATIONARY FUEL CELL POWER SYSTEMS 

924.1 General. Stationary fuel cell power systems having a 
power output not exceeding 10 MW shall be tested in accordance 
with CS A America FC 1 and shall be installed in accordance with 
the manufacturer's installation instructions and NFPA 853. 

SECTION 925 
MASONRY HEATERS 

925.1 General. Masonry heaters shall be constructed in accor- 
dance with the Building Code. 

SECTION 926 
GASEOUS HYDROGEN SYSTEMS 

926.1 Installation. The installation of gaseous hydrogen sys- 
tems shall be in accordance with the applicable requirements of 
this code, the Fire Code, Appendix C and the Building Code. 

SECTION 927 
WOOD STOVES 

927.1 Used wood stoves. 



Note: For reference only. Not adopted as part of this code. 

The installation of used wood stoves defined and regulated by the 
Oregon Department of Environmental Quality's OAR Chapter 340, 
Division 262 (wood-burning room heaters as used in this code) is 
prohibited. 

Exceptions: 

1 . (a) The woodstove was certified by the Department or the 
Administrator on or after July 1, 1986, in accordance with 
emission performance and heating efficiency criteria ap- 
plicable at the time of certification; 

(b) The woodstove has permanently attached an emission 
performance label authorized by the Department or the 
EPA. 

2. Antique wood stoves pursuant to OAR Chapter 340, Divi- 
sion 262. 

3. Pellet stoves under rules adopted pursuant to OAR Chapter 
340, Division 262. 



927.2 Labeling for identification. 



Note: For reference only. Not adopted as part of this code. 

Wood stoves, as defined by the Oregon Department of Environ- 
mental Quality OAR Chapter 340, Division 262, are required by 
DEQ to bear a certification label. 



2007 OREGON MECHANICAL SPECIALTY CODE 



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82 2007 OREGON MECHANICAL SPECIALTY CODE 




CHAPTER 10 



BOILERS, WATER HEATERS AND 
PRESSURE VESSELS 



SECTION 1001 
GENERAL 

1001.1 Scope. The puq)ose of this chapter is to establish and 
provide minimum standards for the protection of the public 
welfare, health and safety, and property by regulating and con- 
trolling the location of steam and hot- water boilers, water heat- 
ers and pressure vessels. Boilers and pressure vessels and their 
related piping are regulated by the Oregon Boiler and Pressure 
Vessel Law. 



SECTION 1002 
WATER HEATERS 

1002.1 General. Potable water heaters and hot water storage 
tanks shall be listed and labeled and installed in accordance 
with the manufacturer's installation instructions, the Plumbing 
Code and where applicable this code. All water heaters shall be 
capable of being removed without first removing a permanent 
portion of the building structure. The potable water connec- 
tions and relief valves for all water heaters shall conform to the 
requirements of the Plumbing Code. 

1002.2 Water heaters utilized for space heating. Water heat- 
ers utilized both to supply potable hot water and provide hot 
water for space-heating applications shall be listed and labeled 
for such applications by the manufacturer and shall be installed 
in accordance with the manufacturer's installation instructions 
and the Plumbing Code. 

1002.2.1 Sizing. Water heaters utilized for both potable 
water heating and space -heating applications shall be sized 
to prevent the space-heating load from diminishing the 
required potable water-heating capacity. 

1002.2.2 Temperature limitation. Where a combination 
potable water-heating and space-heating system requires 
water for space heating at temperatures higher than 140°F 
(60°C), a temperature actuated rhixing valve that conforms 
to ASSE 1017 shall be provided to temper the water sup- 
plied to the potable hot water distribution system to a tem- 
perature of 140T (60°C) or less. 

1002.3 Supplemental water-heating devices. Potable 
water-heating devices that utilize refrigerant-to-water heat 
exchangers shall be approved and installed in accordance with 
the Plumbing Code and the manufacturer's installation instruc- 
tions. 



SECTION 1003 
PRESSURE VESSELS 

1003.1 Scope. The requirements of this section shall apply to the 
boiler rooms, combustion air, chimneys and vents, and fuel pip- 
ing related to the construction, installation, repair and alteration 
of rooms for the installation of boilers and pressure vessels. 



1003.2 Workmanship. All equipment, appurtenances, 
devices and piping shall be installed in a workmanlike manner 
conforming to provisions and intent of this chapter. 

SECTION 1004 
DEFINITIONS 

1004.1 Definitions. Certain words and terms used in this chap- 
ter, unless clearly inconsistent with their context, shall mean as 
follows: 

BOILER. Is defined in ORS 480.515(2). 



ORS 480.515(2) is not a part of this code but is reproduced here for 
theireader's convenience: 

480.515 Definitions for ORS 480.510 to 480.670. 

(2) "Boiler" or "boilers" means: 

(a) A closed vessel or vessels intended for the heating or vaporiz- 
ing of liquids to be used externally to such vessel or vessels by the 
application of heat from combustible fuels, electricity or nuclear 
energy; 

(b) Related appurtenances including but not limited to pressure 
piping directly connected and related to the safe operation of a 
boiler; and 

(c) Pressure piping consisting of boiler or nonboiler external pip- 
ing connected to a boiler, but not potable water nonboiler external 
piping. 



DOMESTIC WATER HEATER. Is defined in ORS 

480.525(l)(b). 



ORS 480.525(l)(b) is not a part of this code but is reproduced here 
for the reader's convenience: 

480.525 Exempt vessels. 

(l)(b) Domestic water heaters designed for heating potable water, 
equipped with an approved pressure-relieving device, containing 
only water and that do not exceed: 

(a) Capacity of 120 gallons; 

(b) Water temperature of 210 degrees Fahrenheit; 

(c) Pressure of 150 pounds per square inch gauge pressure; or 

(d) Heat input of 200,000 BTU per hour. 



SECTION 1005 
PERMITS REQUIRED 

1005.1 Permits. It shall be unlawful to install any boiler or 
pressure vessel regulated by this code without first obtaining a 
permit to do so from the building official and an installation 
permit from the Oregon Building Codes Division, Boiler and 
Pressure Vessel Program. 



2007 OREGON MECHANICAL SPECIALTY CODE 



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SECTION 1006 
DETAILED REQUIREMENTS 

100(5.1 Safety reqiiirememts. The installation of all boilers 
and pressure vessels shall conform to the minimum require- 
ments for safety established by this code. 



.2 Stack dampers. Stack dampers on boilers fired with oil 
or solid fuel shall not close more than 80 percent of the stack 
area when closed, except on automatic boilers with prepurge, 
automatic draft control and interlock. Operative dampers shall 
not be placed within any stack, flue or vent of a gas-fired boiler, 
except on an automatic boiler with prepurge, automatic draft 
control and interlock. 



,1 Expansion tanks. All water heating systems provided 
with an air expansion tank shall be securely fastened to the 
structure; supports shall be adequate to carry twice the weight 
of the tank filled with water without placing any strain on con- 
necting piping. 

All water heating systems incorporating hot- water tanks or 
fluid relief columns shall be installed to prevent freezing under 
normal operating conditions. 



Package boilers, miniature boilers, low-pressure boilers and 
hot- water supply boilers with no manhole on top of shell shall 
have a minimum clearance of 2 feet (610 mm) from the ceiling. 

SECTION 1011 
BOILER ROOM ENCLOSURES 

1011.1 Boiler rooms. Boiler rooms and enclosure's and access 
thereto shall comply with Chapter 3 of this code and the Build- 
ing Code. 

SECTION 1012 
FLOORS 

1012.1 GeeeraL Boilers shall be mounted on floors of 
noncombustible construction unless listed for mounting on 
combustible floors. The floor and related structural supports 
shall be designed as required in the Building Code to carry the 
loads imposed by the boiler and appurtenances. 

SECTION 1013 
CHIMNEYS OR VENTS 

1013.1 GeneraL When required, boilers shall be connected to 
a chimney or vent as provided for other fuel-burning equip- 
ment in Chapter 8 of this code. 



.1 GeneraL The discharge from relief valves shall be 
piped to within 18 inches (457 mm) of the floor or to an open 
receptacle, and when the operating temperature is in excess of 
212°F (100°C), shall be equipped with a splash shield or cen- 
trifugal separator. When the discharge from safety valves 
would result in a hazardous discharge of steam inside the boiler 
room, such discharge shall be extended outside the boiler 
room. No valve of any description shall be placed between the 
safety valve and the atmosphere. 

SECTDON 1009 
GAS=PRESSURE REGULATORS 

1009.1 GeeeraL An approved gas-pressure regulator shall be 
installed on gas-fired boilers where the gas supply pressure is 
higher than that at which the main burner is designed to operate. 
A separate approved gas-pressure regulator shall be installed to 
regulate the gas pressure to the pilot or pilots. A separate regula- 
tor shall not be required for the pilot or pilots on manufac- 
turer-assembled boiler-burner units which have been approved 
by the building official and on gas-fired boilers in Group R occu- 
pancies of less than six units and in Group M occupancies. 



SECTlOi 
CLEARANCE FOR ACCESS 

.1 Access. When boilers are installed or replaced, clear- 
ance shall be provided to allow access for inspection, mainte- 
nance and repair, and passageways shall have an unobstructed 
width of not less than 1 8 inches (457 mm). Clearance for repair 
and cleaning may be provided through a door or access panel 
into another area, provided the opening is of sufficient size. 



SECTION 1014 
DRAINAGE 

1014.1 Drains. The boiler room shall have an approved floor 
drain or equivalent means for disposing of accumulation of liq- 
uid wastes incidental to cleaning or recharging. 

SECTION 1015 
FUEL SUPPLY PIPING 

1015.1 Piping. Fuel supply piping shall conform to Chapter 
13, Appendix C or the standards cited in Chapter 15, Refer- 
enced Standards. 



SECTION 1016 
AIR FOR COMBUSTION AND VENTILATION 

1016.1 GeneraL Air for combustion and ventilation shall be 
according to Chapter 7 or Appendix C of this code. 

SECTION 1017 
STEAM AND WATER PIPING 



Note: Boilers and pressure vessels and related piping are regulated 
by the State of Oregon Boiler and Pressure Vessel Law (ORS 
480.510 to 480.670). 



1017.1 GeneraL Steam piping is regulated according to and under 
the jurisdiction of the Oregon Boiler and Pressure Vessel Law and 
related administrative rules and the jurisdiction of Oregon Build- 
ing Codes Division, Boiler and Pressure Vessel Program. Water 
piping for hot- water heating systems and hydronics shall be regu- 
lated and installed according to Chapter 12 of this code. 



84 



2007 OREGON MECHANICAL SPECIALTY CODE 



CHAPTER 11 

REFRIGERATION 



SECTION 1101 
GENERAL 

1101.1 Scope. This chapter shall govern the design, installa- 
tion, construction and repair of refrigeration systems that 
vaporize and liquefy a fluid during the refrigerating cycle. 
Refrigerant piping design and installation, including pressure 
vessels and pressure relief devices, shall conform to this code. 
Permanently installed refrigerant storage systems and other 
components shall be considered as part of the refrigeration sys- 
tem to which they are attached. 



Note: Brazing certifications required. A person qualified for in- 
spection of brazing or welding of refrigeration piping shall have 
a valid certification meeting the requirements in OAR 
918-098-1080. A person engaged in the brazing or welding of 
refrigeration piping shall have a valid certification meeting the 
requirements in OAR 918-440-0015. For refrigeration piping 
regulated by the State of Oregon Boiler and Pressure Vessel 
Program, see requirements listed in OAR 918-225-0310. All 
three of these administrative rules were effective July 1, 2001. 

918-098-1080 

Refrigeration Inspector Certification 

(1) All persons engaged in the inspection of brazing or welding re- 
lated to the installation, alteration or repair of refrigeration piping 
systems, except as regulated by the Oregon Boiler and Pressure 
Vessel Program under OAR Chapter 918, Division 225, shall: 

(a) Possess a current and valid A- or B-level Mechanical Inspec- 
tor Certification issued under OAR 918-098-0120 or 
918-098-0130; and 

(b) Successfully complete a training program in accordance with 
either Section IX, "Welding and Brazing Qualification" of the 
ASME Boiler and Pressure Vessel Code, or AWS B2.2, "Stan- 
dard for Brazing Procedure and Performance Qualification" is- 
sued by a division-approved organization. 

(2) Inspector certification for refrigeration piping in one- and 
two-family dwellings is not required. 

918-440-0015 

Refrigeration Installer Certification 

All persons engaged in brazing or welding related to the installa- 
tion, alteration or repair of refrigeration piping systems not regu- 
lated by the Oregon Boiler and Pressure Vessel Program under 
OAR Chapter 918, Division 225, shall be certified in accordance 
with the requirements of this rule. 

(1) The minimum requirement for persons engaged in brazing or 
welding of refrigeration piping systems is a current and valid certif- 
ication issued upon completion of a class by a division-approved 
certifying organization in brazing or welding in accordance with ei- 
ther: 

(a) Section IX, Welding and Brazing Qualifications of the 
ASME Boiler and Pressure Vessel Code; or 

(b) AWS B2.2, Standard for Brazing Procedure and Perfor- 
mance Qualification. 



(2) Refrigeration systems installed in dwelling units regulated un- 
der the One- and Two-Family Dwelling Specialty Code are ex- 
empt from this rule. 

(3) All refrigeration piping system requirements not regulated by 
OAR 918-225-0310 are subject to the Oregon Mechanical Spe- 
cialty Code. 

918-225-0310 

Refrigerant Piping Systems; Components 

(1) The requirements of OAR 918-225-0430(5) shall be enforced 
under this rule for all refrigerant piping systems consisting of 
welded, brazed or mechanically assembled piping and piping fit- 
tings exceeding 2 inches NPS, and containing any refrigerant 
chemical rated as other than A-1 or B-1 by the American Society of 
Heating, Refrigeration and Air Conditioning Engineers (ASHRAE 
34) as adopted by the Oregon Mechanical Specialty Code. 

(2) One- and two-family dwelling units and air conditioning refrig- 
eration systems used solely for human comfort are exempt from 
this rule. 

(3) All refrigeration piping system requirements other than those 
regulated by this rule are subject to the Oregon Mechanical Spe- 
cialty Code. 



1101.2 Factory-built equipment and appliances. Listed and 
labeled self-contained, factory-built equipment and appliances 
shall be tested in accordance with UL 207, 412, 471 or 1995. 
Such equipment and appliances are deemed to meet the design, 
manufacture and factory test requirements of this code if 
installed in accordance with their listing and the manufac- 
turer's installation instructions. 

1101.3 Protection. Any portion of a refrigeration system that 
is subject to physical damage shall be protected in an approved 
manner. 

1101.4 Water connection. Water supply and discharge con- 
nections associated with refrigeration systems shall be made in 
accordance with this code and the Plumbing Code. 

1101.5 Fuel gas connection. Fuel gas devices, equipment and 
appliances used with refrigeration systems shall be installed in 
accordance with Appendix C. 

1101.6 General. Refrigeration systems shall comply with the 
requirements of this code and, except as modified by this code, 
ASHRAE 15. Ammonia-refrigerating systems shall comply 
with this code and, except as modified by this code, ASHRAE 
15andIIAR2. 



SECTION 1102 
SYSTEM REQUIREMENTS 

1102.1 General. The system classification, allowable refriger- 
ants, maximum quantity, enclosure requirements, location lim- 



< 



2007 OREGON MECHANICAL SPECIALTY CODE 



85 



REFRIGERATION 



itations, and field pressure test requirements shall be 
determined as follows: 

1. Determine the refrigeration system's classification, in 
accordance with Section 1103.3. 

2. Determine the refrigerant classification in accordance 
with Section 1103.1. 

3. Determine the maximum allowable quantity of refriger- 
ant in accordance with Section 1104, based on type of 
refrigerant, system classification and occupancy. 

4. Determine the system enclosure requirements in accor- 
dance with Section 1104. 

5. Refrigeration equipment and appliance location and 
installation shall be subject to the limitations of Chapter 3. 

6. Nonfactory-tested, field-erected equipment and appli- 
ances shall be pressure tested in accordance with Section 
1108. 

1102.2 Refrigerants. The refrigerant shall be that which the 
equipment or appliance was designed to utilize or converted to 
utilize. Refrigerants not identified in Table 1103.1 shall be 
approved before use. 

1102.2.1 Mixing. Refrigerants, including refrigerant 
blends, with different designations in ASHRAE 34 shall not 
be mixed in a system. 

Exception; Addition of a second refrigerant is allowed 
where permitted by the equipment or appliance manu- 
facturer to improve oil return at low temperatures. The 
refrigerant and amount added shall be in accordance with 
the manufacturer's instructions. 

1102.2.2 Purity. Refrigerants used in refrigeration systems 
shall be new, recovered or reclaimed refrigerants in accor- 
dance with Section 1102.2.2.1, 1102.2.2.2 or 1102.2.2.3. 
Where required by the equipment or appliance owner or the 
code official, the installer shall furnish a signed declaration 
that the refrigerant used meets the requirements of Section 
1102.2.2.1, 1102.2.2.2 or 1102.2.2.3. 

Exception: The refrigerant used shall meet the purity 
specifications set by the manufacturer of the equipment 
or appliance in which such refrigerant is used where such 
specifications are different from that specified in Sec- 
tions 1102.2.2.1, 1102.2.2.2 and 1102.2.2.3. 

1102.2.2.1 New refrigerants. Refrigerants shall be of a 
purity level specified by the equipment or appliance 
manufacturer. 

1102.2.2.2 Recovered refrigerants. Refrigerants that 
are recovered from refrigeration and air-conditioning 
systems shall not be reused in other than the system from 
which they were recovered and in other systems of the 
same owner. Recovered refrigerants shall be filtered and 
dried before reuse. Recovered refrigerants that show 
clear signs of contamination shall not be reused unless 
reclaimed in accordance with Section 1102.2.2.3. 

1102.2.2.3 Reclaimed refrigerants. Used refrigerants 
shall not be reused in a different owner's equipment or 
appliances unless tested and found to meet the purity 
requirements of ARI 700. Contaminated refrigerants 



shall not be used unless reclaimed and found to meet the 
purity requirements of ARI 700. 



SECTION 1103 
REFRIGERATION SYSTEM CLASSIFICATION 

1103.1 Refrigerant classification. Refrigerants shall be classi- 
fied in accordance with ASHRAE 34 as listed in Table 1 103.1. 

1103.2 Occupancy classification. Locations of refrigerating 
systems are described by occupancy classifications that con- 
sider the ability of people to respond to potential exposure to 
refrigerants. Where equipment or appliances, other than pip- 
ing, are located outside a building and within 20 feet (6096 
mm) of any building opening, such equipment or appliances 
shall be governed by the occupancy classification of the build- 
ing. Occupancy classifications shall be defined as follows: 

1 . Institutional occupancy is that portion of premises from 
which, because they are disabled, debilitated or con- 
fined, occupants cannot readily leave without the assis- 
tance of others. Institutional occupancies include, among 
others, hospitals, nursing homes, asylums and spaces 
containing locked cells. 

2. Public assembly occupancy is that portion of premises 
where large numbers of people congregate and from 
which occupants cannot quickly vacate the space. Public 
assembly occupancies include, among others, auditori- 
ums, ballrooms, classrooms, passenger depots, restau- 
rants and theaters. 

3. Residential occupancy is that portion of premises that 
provides the occupants with complete independent liv- 
ing facilities, including permanent provisions for living, 
sleeping, eating, cooking and sanitation. Residential 
occupancies include, among others, dormitories, hotels, 
multiunit apartments and private residences. 

4. Commercial occupancy is that portion of premises where 
people transact business, receive personal service or pur- 
chase food and other goods. Commercial occupancies 
include, among others, office and professional buildings, 
markets (but not large mercantile occupancies) and work 
or storage areas that do not qualify as industrial occupan- 
cies. 

5. Large mercantile occupancy is that portion of premises 
where more than 100 persons congregate on levels above 
or below street level to purchase personal merchandise. 

6. Industrial occupancy is that portion of premises that is 
not open to the public, where access by authorized per- 
sons is controlled, and that is used to manufacture, pro- 
cess or store goods such as chemicals, food, ice, meat or 
petroleum. 

7. Mixed occupancy occurs when two or more occupancies 
are located within the same building. When each occu- 
pancy is isolated from the rest of the building by tight 
walls, floors and ceilings and by self-closing doors, the 
requirements for each occupancy shall apply to its por- 
tion of the building. When the various occupancies are 
not so isolated, the occupancy having the most stringent 
requirements shall be the governing occupancy' 



86 



2007 OREGON MECHANICAL SPECIALTY CODE 



i^fi 



TABLE 
REFRIGERANT CLASSIFICATION, AMOUNT AND TLV-TWA 



REFRIGERANT 


CHEMICAL 
FORMULA 


CHEMICAL NAME OR BLEND 


HAZARD 
CATEGORIES^ 


REFRIGERANT 
CLASSIFICATION 


DEGREES 
OF HAZARD" 


[M] AMOUNT OF REFRIGERANT PER OCCUPIED SPACE 


Pounds per 

1 ,000 cubic 

feet 


ppm 


g/m^ 


TLV-TWA' 
(ppm) 


R-IP 


CCl.F 


Trichlorofluoromethane 


OHH 


Al 


2-0-0'= 


0.39 


1,100 


6.2 


€1,000 


R-12^ 


CCI7F2 


Dichlorodifluoromethane 


CG,OHH 


Al 


2-0-0"= 


5.6 


18,000 


90 


1,000 


R-13« 


CCIF3 


Chlorotrifluoromethane 


CG,OHH 


Al 


2-0-0^ 


18 


67,000 


290 


1,000 


R-13BP 


CBrP, 


Bromotrifluoromethane 


CG,OHH 


Al 


2-0-0'= 


22 


57,000 


350 


1,000 


R-14 


CF, 


Tetrafluoromethane (carbon tetrafluoride) 


CG,OHH 


Al 


2-0-0'= 


16 


69,000 


250 


1,000 


R-22 


CHCIF2 


Chlorodifluoromethane 


CG,OHH 


Al 


2-0-0^ 


5.5 


25,000 


89 


1,000 


R-23 


CHF^ 


Trifluoromethane (fluoroform) 


CG,OHH 


Al 


2-0-0= 


7.3 


41,000 


120 


1,000 


R-32 


CH,F2 


Difluoromethane (methylene fluoride) 


CG,F,OHH 


A2 


— 


4.2 


32,000 


68 





R-m'^ 


CCI2FCCIF2 


1, l,2-trichloro-l,2,2-trifluoroethane 


OHH 


Al 


2-0-0= 


1.2 


2,600 


20 


1,000 


R-IU'^ 


CCIF2CCIF2 


1 ,2-dichloro- 1,2,2-tetrafluoroethane 


CG,OHH 


Al 


2-0-0"= 


8.7 


20,000 


140 


1,000 


R-116 


CF3CF3 


Hexafluoroethane 


CH,OHH 


Al 


1-0-0 


24 


69,000 


390 





R-123 


CHCI2CF3 


2,2-dichloro-l ,1 ,1 -trifluoroethane 


OHH 


Bl 


2-0-0"= 


3.5 


9,100 


57 


50 


R-124 


CHCIFCF^ 


2-chloro- 1,1,1 ,2-tetrafluoroethane 


CG,OHH 


Al 


2-0-0"= 


3.5 


10,000 


56 


1,000 


R-125 


CHF2CF, 


Pentafluoroethane 


CG,OHH 


Al 


2-0-0"= 


21 


69,000 


340 





R-134a 


CH2FCF, 


1,1,1 ,2-tetrafluoroethane 


CG,OHH 


Al 


2-0-0"= 


13 


50,000 


210 


1,000 


R-143a 


CH.CF, 


1,1,1 -trifluoroethane 


CG,F,OHH 


A2 


2-0-0'= 


■3.8 


18,000 


60 





R-152a 


CH,CHF2 


1,1-difluorethane 


CG,F,OHH 


A2 


1-4-0 


1.6 


9,300 


25 


— 


R-170 


CH^CH^ 


Ethane 


CG,F,OHH 


A3 


2-4-0 


0.54 


7,000 


8.7 


1,000 


R^218 


CF.CF^CF, 


Octafluoropropan e 


CG,OHH 


Al 


2-0-0'= 


33 


69,000 . 


530 





R-236fa 


CF,CH,CF, 


1,1,1,3,3,3-hexafluoropropane 


CG,OHH 


Al 


2-0-0'= 


21 


55,000 


— 


1,000 


R-245fa 


CHF2CH2CFt 


1,1, 1 ,3 ,3-pentafluoropropane 


CG,OHH 


Bl 


2-0-0'= 


12 


34,000 


— 


300 


R-290 


UH-^C-ri2V-.rl3 


Propane 


CG,F,OHH 


A3 


2-4-0 


0.56 


5,000 


9.0 


2,500 


R400'= 


zeotrope 


R-12/114 


CG,OHH 


Al 


2-0-0= 


9.3 


26,000 


150 


— 


R-406A 


zeotrope 


R-22/600a/142b (55/4/41) 


CG,F,OHH 


A2 











--— 





R-401A 


zeotrope 


R-22/152a/l 24 (53/13/34) 


CG,OHH 


Al 


2-0-0= 


4.8 


20,000 


77 


— 


R-401B 


zeotrope 


R-22/152a/124 (61/1 1/28) 


CG,OHH 


Al 


2-0-0= 


4.9 


21,000 


79 


— 


R-401C 


zeotrope 


R-22/152a/124 (33/15/52) 


CG,OHH 


Al 


2-0-0= 


4.4 


17,000 


71 





R-402A 


zeotrope 


R-125/290/22 (60/2/38) 


CG,OHH 


Al 


2-0-0= 


10 


39,000 


160 


— 


R-402B 


zeotrope 


R-125/290/22 (38/2/60) 


CG,OHH 


Al 


2-0-0= 


7.8 


32,000 


120 . 


— 



(continued) 



[F] TABLE 1103.1— continued 
REFRIGERANT CLASSIFICATION, AMOUNT AND TLV-TWA 



O 
33 
m 
O 
O 

z 

m 
o 

T 
> 

Z 

o 

> 

u> 

■D 

m 
o 

> 

< 

O 
O 
D 

m 



REFRIGERANT 


CHEMICAL 
FORMULA 


CHEMICAL NAME OR BLEND 


HAZARD 
CATEGORIES^ 


REFRIGERANT 
CLASSIFICATION 


degrees of 
hazard" 


[M] AMOUNT OF REFRIGERANT PER OCCUPIED SPACE 


Pounds per 

1,000 cubic 

feet 


ppm 


g/m^" 


TLV-TWA* 
(ppm) 


R-403A 


zeotrope 


R-290/22/2 18 (5/75/20) 


CG,OHH 


Al 


2-0-0^^ 


— 


— 


— 


— 


R-403B 


zeotrope 


R-290/22/218 (5/56/39) 


CG,OHH 


Al 


2-0-0'^ 


— 


— 


— 


— 


R-404A 


zeotrope 


R-125/143a/l 34a (44/52/4) 


CG,OHH 


Al 


2-0-0^ 


17 


69,000 


280 





R-407A 


zeotrope 


R-32/1 25/1 34a (20/40/40) 


CG,OHH 


Al 


2-0-0^ 


16 


69,000 


260 


— 


R-407B 


zeotrope 


R-32/1 25/1 34a (10/70/20) 


CG,OHH 


Al 


2-0-0^ 


18 


69,000 


290 


— 


R-407C 


zeotrope 


R-32/125/134a (23/25/52) 


CG,OHH 


Al 


2-0-0^ 


15 


69,000 


240 


— 


R-407D 


zeotrope 


R-32/125/134a (15/15/70) 


CG,OHH 


Al 


2-0-0'-' 


15 


65,000 


240 


— 


R-407E 


zeotrope 


R-32/125/134a (25/15/60) 


CG,OHH 


Al 


2-0-0*^ 


15 


69,000 


240 


— 


R-408A 


zeotrope 


R- 1 25/1 43a/22 (7/46/47) 


CG,OHH 


Al 


2-0-0^ 


10 


47,000 


170 


— 


R-409A 


zeotrope 


R-22/124/142b (60/25/15) 


CG.OHH 


Al 


2-0-0= 


4.9 


20,000 


79 


— 


R-409B 


zeotrope 


R-22/124/142b (65/25/10) 


CG,OHH 


Al 


2-0-0= 


4.9 


20,000 


78 


— 


R410A 


zeotrope 


R-32/1 25 (50/50) 


CG,OHH 


Al 


2-0-0= 


10 


55,000 


160 


— 


R-410B 


zeotrope 


R-32/125 (45/55) 


CG,OHH 


Al 


2-0-0= 


11 


58,000 


180 


— 


R-411A 


zeotrope 


R-127/22/152a (1.5/87.5/11.0) 


CG,F,OHH 


A2 


— 


— 


— 


— 


— 


R-411B 


zeotrope 


R- 1270/22/1 52a (3/94/3) 


CG,F,OHH 


A2 


— 


— 


— 


— 


— 


R-507A 


azeotrope 


R-125/143a (50/50) 


CG,OHH 


Al 


2-0-0= 


17 


69,000 


280 


— 


R-508A 


azeotrope 


R-23/1 16 (39/61) 


CG,OHH 


Al 


2-0-0= 


14 


55,000 


220 


— 


R-508B 


azeotrope 


R-23/1 16 (46/54) 


CG,OHH 


Al 


2-0-0= 


13 


52,000 


200 


— 


R-509A 


zeotrope 


R-22/218 (44/56) 


CG,OHH 


Al 


2-0-0= 


12 


38,000 


190 


— 


R-600 


C-ri3(_ri2C_,ri2C.ri3 


Butane 


CG,F,OHH 


A3 


1-4-0 


— 


— 


— 


— 


R-600a 


CH(CH3)2-CH3 


Isobutane (2-methyl propane) 


CG,F,OHH 


A3 


2-4-0 


0.51 


2,500 


6.0 


800 



(continued) 



[F] TABLE 1103.1— continued 
REFRIGERANT CLASSIFICATION, AMOUNT AND TLV-TWA 



REFRIGERANT 


CHEMICAL 
FORMULA 


CHEMICAL NAME OR BLEND 


HAZARD 
CATEGORIES^ 


REFRIGERANT 
CLASSIFICATION 


DEGREES 
OF HAZARD'' 


[M] AMOUNT OF REFRIGERANT PER OCCUPIED SPACE 


Pounds per 

1,000 cubic 

feet 


ppm 


g/m^" 


TLV-TWA' 
(ppm) 


R-412A 


zeotrope 


R-22/3 18/1 42b (70/5/25) 


CG,F,OHH 


A2 


— 











— 


R-413A 


zeotrope 


R-218/134a/600a (9/88/3) 


CG,F,OHH 


A2 


— 


— 


— 


— 


— 


R-414A 


zeotrope 


R-22/124/600a/142b (51/28.5/4/16.5) 


CG,OHH 


Al 


— 














R-414B 


zeotrope 


R-22/1 24/600a/142b (50/39/1 .5/9.5) 


CG,OHH 


Al 


— 


— 


— 


— 


— 


R-416A 


zeotrope 


R-134a/l 24/600 (59/39.5/1.5) 


CG,OHH 


Al 


2-0-0^^ 


6 


21,000 


96 


— 


R-417A 


zeotrope 


R-125/134a/600 (45.5/50/3.5) 


CG,OHH 


Al 


2-0-0^^ 


— 


— 


— 


— 


R-SOO'^ 


azeotrope 


R-12/152a (73.8/26.2) 


CG,OHH 


Al 


2-0-0'^ 


7.4 


29,000 


120 


1,000 


R-502« 


azeotrope 


R-22/1 15 (48.8/51.2) 


CG,OHH 


Al 


2-0-0<^ 


10 


35,000 


160 


1,000 


R-503^ 


azeotrope 


R-23/13 (40.1/59.9) 


CG,OHH 


Al 


2-0-0'^ 


15 


67,000 


240 


1,000 


R-717 


NH3 


Ammonia 


CG,C,F,OHH 


B2 


3-3-0'' 


0.022 


500 


0.35 


25 


R-718 


H2O 


Water 


— 


Al 


0-0-0 


— 





— 


— 


R-744 


CO2 


Carbon dioxide 


CG,OHH 


Al 


2-0-0^^ 


4.5 


40,000 


72 


5,000 


R-1150 


CH2=CH2 


Ethene (ethylene) 


CG,F,OHH 


A3 


1-4-2 


0.38 


5,200 


6.0 


1,000 


R-1270 


CH3CH=CH2 


Propene (propylene) 


CG,F,OHH 


B3 


1-4-1 


0.37 


3,400 


5.0 


660 



For SI: 1 pound = 0.454 kg, 1 cubic foot = 0.0283 m\ 

a. CG = Compressed gas; C = Corrosive; F = Flammable; OHH = Other Health Hazard. 

b. Degrees of hazard are for health, fire, and reactivity, respectively, in accordance with NFPA 704. 

c. Reduction to 1 -0-0 is allowed if analysis satisfactory to the code official shows that the maximum concentration for a rupture or full loss of refrigerant charge would not exceed the IDLH, considering both the 
refrigerant quantity and room volume. 

d. For installations that are entirely outdoors, use 3-1-0. 

e. Class I ozone depleting substance; prohibited for new installations. 

f. PEL or consistent occupational exposure limit on a time-weighted average (TWA) basis (unless noted C for ceiling) for an 8 hr/d and 40 hr/wk. 



REFRIGERATION 



5.3 System classificatiom. Refrigeration systems shall be 
classified according to the degree of probability that refrigerant 
leaked from a failed connection, seal, or component could 
enter an occupied area. The distinction is based on the basic 
design or location of the components. 

ll®3.3ol Low-probability systems. Double-indirect 
open-spray systems, indirect closed systems and indirect- 
vented closed systems shall be classified as low-probability 
systems, provided that all refrigerant-containing piping and 
fittings are isolated when the quantities in Table 1 103.1 are 
exceeded. 

1103.3.2 High-probability systems. Direct systems and 
indirect open-spray systems shall be classified as 
high-probability systems. 

Exception: An indirect open-spray system shall not be 
required to be classified as a high-probability system if 
the pressure of the secondary coolant is at all times (oper- 
ating and standby) greater than the pressure of the refrig- 
erant. 



SECTION 1104 
lYSTEftffl APPLICATION REQUIREMENTS 

1.1 General. The refrigerant, occupancy and system clas- 
sification cited in this section shall be determined in accor- 
dance with Sections 1103.1, 1103.2 and 1103.3, respectively. 
For refrigerant blends assigned dual classifications, as formu- 
lated and for the worst case of fractionation, the classifications 
for the worst case of fractionation shall be used. 



1.2 Machinery room. Except as provided in Sections 
1 104.2. 1 and 1 104.2.2, all components containing the refriger- 
ant shall be located either outdoors or in a machinery room 
where the quantity of refrigerant in an independent circuit of a 
system exceeds the amounts shown in Table 1 1 03. 1 . For refrig- 
erant blends not listed in Table 1103.1, the same requirement 
shall apply when the amount for any blend component exceeds 
that indicated in Table 1103.1 for that component. This 
requirement shall also apply when the combined amount of the 
blend components exceeds a limit of 69,100 parts per million 
(ppm) by volume. Machinery rooms required by this section 
shall be constructed and maintained in accordance with Sec- 
tion 1 105 for Group Al and Bl refrigerants and in accordance 
with Sections 1105 and 1106 for Group A2, B2, A3 and B3 
refrigerants. 



1 . Machinery rooms are not required for hsted equip- 
ment and appliances containing not more than 6.6 
pounds (3 kg) of refrigerant, regardless of the refrig- 
erant' s safety classification, where installed in accor- 
dance with the equipment's or appliance's listing and 
the equipment or appliance manufacturer's installa- 
tion instructions. 

2. Piping in conformance with Section 1 107 is allowed 
in other locations to connect components installed in 
a machinery room with those installed outdoors. 

1104.2.1 Institutional occupancies. The amounts shown 
in Table 1 103.1 shall be reduced by 50 percent for all areas 



of institutional occupancies except kitchens, laboratories, 
and mortuaries. The total of all Group A2, B2, A3 and B3 
refrigerants shall not exceed 550 pounds (250 kg) in occu- 
pied areas or machinery rooms. 

1104.2.2 Industrial occupancies and refrigerated rooms. 
This section applies only to industrial occupancies and 
refrigerated rooms for manufacturing, food and beverage 
preparation, meat cutting, other processes and storage. 
Machinery rooms are not required where all of the follow- 
ing conditions are met: 

1 . The space containing the machinery is separated from 
other occupancies by tight construction with tight-fit- 
ting doors. 

2. Access is restricted to authorized personnel. 

3. The floor area per occupant is not less than 100 square 
feet (9.3 m^) where machinery is located on floor lev- 
els with exits more than 6.6 feet (2012 mm) above the 
ground. Where provided with egress directly to the 
outdoors or into approved building exits, the mini- 
mum floor area shall not apply. 

4. Refrigerant detectors are installed as required for 
machinery rooms in accordance with Section 1 105.5. I I 

5. Surfaces having temperatures exceeding 800°F 
(427°C) and open flames are not present where any 
Group A2, B2, A3 or B3 refrigerant is used (see Sec- 
tion 1104.3.4). 

6. All electrical equipment and appliances conform to 
Class 1, Division 2, hazardous location classification 
requirements of NFPA 70 where the quantity of any 
Group A2, B2, A3 or B3 refrigerant in a single inde- 
pendent circuit would exceed 25 percent of the lower 
flammability limit (LFL) upon release to the space. 

7. All refrigerant-containing parts in systems exceeding 
100 hp (74.6 kW) drive power, except evaporators 
used for refrigeration or dehumidification; condens- 
ers used for heating; control and pressure relief valves 
for either; and connecting piping, shall be located 
either outdoors or in a machinery room. 

1104.3 Refrigerant restrictions. Refrigerant applications, 
maximum quantities and use shall be restricted in accordance 
with Sections 1 104.3.1 through 1 104.3.4. 

1104.3.1 Air-conditioning for human comfort. In other 
than industrial occupancies where the quantity in a single 
independent circuit does not exceed the amount in Table 
1 103. 1, Group B 1, B2 and B3 refrigerants shall not be used 
in high-probability systems for air-conditioning for human 
comfort. 

1104.3.2 Nonindustrial occupancies. Group A2 and B2 
refrigerants shall not be used in high-probability systems 
where the quantity of refrigerant in any independent refrig- 
erant circuit exceeds the amount shown in Table 1104.3.2. 
Group A3 and B3 refrigerants shall not be used except 
where approved. 

Exception: This section does not apply to laboratories 
where the floor area per occupant is not less than 100 
square feet (9.3 m^). 



90 



2007 OREGON WlECHAhSICAL SPECIALTY CODE 



REFRIGERATION 



TABLE 1104.3.2 
MAXIMUM PERMISSIBLE QUANTITIES OF REFRIGERANTS 



TYPE OF REFRIGERATION SYSTEM 


MAXIMUM POUNDS FOR VARIOUS OCCUPANCIES 


Institutional 


Assembly 


Residential 


All other occupancies 


Sealed absorption system 
In exit access 

In adjacent outdoor locations 
In other than exit access 











6.6 


3.3 
22 
6.6 


3.3 
22 
6.6 


Unit systems 

In other than exit access 








6.6 


6.6 



For SI: 1 pound = 0.454 kg. 



1104.3.3 All occupancies. The total of all Group A2, B2, 
A3 and B3 refrigerants other than R-717, ammonia, shall 
not exceed 1,100 pounds (499 kg) except where approved. 

1104.3.4 Protection from refrigerant decomposition. 

Where any device having an open flame or surface tempera- 
ture greater than 800°F (427°C) is used in a room containing 
more than 6.6 pounds (3 kg) of refrigerant in a single inde- 
pendent circuit, a hood and exhaust system shall be pro- 
vided in accordance with Section 5 10. Such exhaust system 
shall exhaust combustion products to the outdoors. 

Exception: A hood and exhaust system shall not be 
required: 

1. Where the refrigerant is R-717, R-718, or R-744; 

2. Where the combustion air is ducted from the out- 
doors in a manner that prevents leaked refrigerant 
from being combusted; or 

3. Where a refrigerant detector is used to stop the 
combustion in the event of a refrigerant leak (see 
Sections 1105.5 and 1105.7). 

1104.4 Volume calculations. Volume calculations shall be in 
accordance with Sections 1104.4.1 through 1104.4.3. 

1104.4.1 Noncommunicating spaces. Where the refriger- 
ant-containing parts of a system are located in one or more 
spaces that do not communicate through permanent open- 
ings or HVAC ducts, the volume of the smallest, enclosed 
occupied space shall be used to determine the permissible 
quantity of refrigerant in the system. 

1104.4.2 Communicating spaces. Where an evaporator or 
condenser is located in an air duct system, the volume of the 
smallest, enclosed occupied space served by the duct system 
shall be used to determine the maximum allowable quantity 
of refrigerant in the system. 

Exception: If airflow to any enclosed space cannot be 
reduced below one-quarter of its maximum, the entire 
space served by the air duct system shall be used to deter- 
mine the maximum allowable quantity of refrigerant in 
the system. 

1104.4.3 Plenums. Where the space above a suspended 
ceiling is continuous and part of the supply or return air ple- 
num system, this space shall be included in calculating the 
volume of the enclosed space. 



SECTION 1105 
MACHINERY ROOM, GENERAL REQUIREMENTS 

1105.1 Access. Access to machinery rooms shall be restricted 
to authorized personnel. A sign shall be posted on the machin- 
ery room door prohibiting access by others. 

1105.2 Dimensions. A machinery room shall be dimensioned 
so as to provide clearances required by Chapter 3. There shall 
be clear head room of not less than 7 74 feet (2210 mm) below 
equipment and appliances located over passageways. 

1105.3 Doors. Each machinery room shall have self-closing, 
weather-stripped doors opening in the direction of egress 
travel. Doors and door openings shall comply with the require- 
ments of the Building Code. 

1105.4 Openings. Openings to other parts of the building that 
permit passage of escaping refrigerant to other parts of the 
building are prohibited. Ducts and air handlers in the machin- 
ery room that operate at a lower pressure than the room shall be 
sealed to prevent any refrigerant leakage from entering the 
airstream. 

Exceptions: 

1 . Egress doors serving the machinery room. 

2. Access doors and panels in air ducts and air-handling 
units, provided that such openings are gasketed and 
tight fitting. 

1105.5 Refrigerant detector. Machinery rooms shall contain 
a refrigerant detector with an audible and visual alarm. The 
detector or a sampling tube that draws air to the detector shall 
be located in an area where refrigerant from a leak will concen- 
trate. The alarm shall be actuated at a value not greater than the 
corresponding TLV-TWA values shown in Table 1103.1. 
Detectors and alarms shall be placed in approved locations 

Exception: Detectors are not required for ammonia system 
complying with Section 1 106.8. 

1105.6 Tests. Periodic tests of the mechanical ventilating sys- 
tem shall be performed in accordance with manufacturer's 
specifications and as required by the code official. 

1105.7 Fuel-burning appliances. Fuel-burning appliances 
and equipment having open flames and that use combustion air 
from the machinery room shall not be installed in a machinery 
room. 

Exceptions: 

1 . Where the refrigerant is carbon dioxide or water. 



2007 OREGON MECHANICAL SPECIALTY CODE 



91 



REFRIGERATION 



2. Fuel-burning appliances shall not be prohibited in the 
same machinery room with refrigerant-containing 
equipment or appliances where combustion air is 
ducted from outside the machinery room and sealed 
in such a manner as to prevent any refrigerant leakage 
from entering the combustion chamber, or where a 
refrigerant vapor detector is employed to automati- 
cally shut off the combustion process in the event of 
refrigerant leakage. 

ll<D5o8 Ventilation. Machinery rooms shall be mechanically 
ventilated to the outdoors. Mechanical ventilation shall be 
capable of exhausting the minimum quantity of air both at nor- 
mal operating and emergency conditions. Multiple fans or 
multispeed fans shall be allowed in order to produce the emer- 
gency ventilation rate and to obtain a reduced airflow for nor- 
mal ventilation. 

Exceptiomi Where a refrigerating system is located out- 
doors more than 20 feet (6096 mm) from any building open- 
ing and is enclosed by a penthouse, lean-to or other open 
structure, natural or mechanical ventilation shall be pro- 
vided. Location of the openings shall be based on the rela- 
tive density of the refrigerant to air. The free-aperture cross 
section for the ventilation of the machinery room shall be 
not less than: 



F= 4g 

For SI: F= 0.138 Vg 



(Equation 11-1) 



1105.8.4 Quantity — emergency conditions. Upon actua- 
tion of the refrigerant detector required in Section 1105.5, 
the mechanical ventilation system shall exhaust air from the 
machinery room in the following quantity: 

<2 = 1 00 X Vg (Equation 11-2) 

For SI: Q = 0.07 x 4g 

where: 

Q = The airflow in cubic feet per minute (mVs). 

G = The design mass of refrigerant in pounds (kg) in the 
largest system, any part of which is located in the 
machinery room. 

1105.9 Termination of relief devices. Pressure rehef devices, 
fusible plugs and purge systems located within the machiner>' 
room shall terminate outside of the structure at a location not 
less than 15 feet (4572 mm) above the adjoining grade level and 
not less than 20 feet (6096 mm) from any window, ventilation 
opening or exit. 

1105.10 Ammonia discharge. Pressure relief valves for 
ammonia systems shall discharge in accordance with 
ASHRAE 15. 

1105.11 Emergency pressure control system. Refrigeration 
systems containing more than 6.6 pounds (3 kg) of flammable, 
toxic or highly toxic refrigerant or ammonia shall be provided 
with an emergency pressure control system in accordance with 
Section 606.10 of the Fire Code. 



where: 

F = The free opening area in square feet (m^). 

G = The mass of refrigerant in pounds (kg) in the largest 
system, any part of which is located in the machinery 
room. 

1105.8.1 Discharge location. The discharge of the air shall 
be to the outdoors in accordance with Chapter 5. Exhaust 
from mechanical ventilation systems shall be discharged 
not less than 20 feet (6096 mm) from a property line or 
openings into buildings. 

1105.8.2 Makeup air. Provisions shall be made for makeup 
air to replace that being exhausted. Openings for makeup air 
shall be located to avoid intake of exhaust air. Supply and 
exhaust ducts to the machinery room shall serve no other 
area, shall be constructed in accordance with Chapter 5 and 
shall be covered with corrosion-resistant screen of not less 
than V4-inch (6.4 mm) mesh. 

1105.8.3 Quantity — normal ventilation. During occupied 
conditions, the mechanical ventilation system shall exhaust 
the larger of the following: 

1. Not less than 0.5 cfm per square foot (0.0025 mVs • 
m^) of machinery room area or 20 cfm (0.009 m^/s) 
per person; or 

2. A volume required to limit the room temperature rise 
to 18°F (10°C) taking into account the ambient heat- 
ing effect of all machinery in the room. 



SECTION 1106 
MACHINERY ROOM, SPECIAL REQUIREMENTS 

j.l General, Where required by Section 1104.2, the 
machinery room shall meet the requirements of this section in 
addition to the requirements of Section 1105. 

1106.2 Elevated temperature. There shall not be an open 
flame-producing device or continuously operating hot surface 
over 800°F (427°C) permanently installed in the room. 

1106.3 Construction requirements. The machinery room 
shall be separated from other occupied space with smoke-tight, 
1-hour fire-resistance-rated construction. 

1106.4 Opening protection. Opening protection between the 
machinery room and other occupied spaces shall be approved, 
self-closing, tight-fitting fire doors with a minimum fire-resis- 
tance rating of '^/^ hour. 

1106.5 Pipe penetrations. All pipe penetrations of the interior 
walls, ceiling or floor of machinery rooms shall be sealed vapor 
tight and protected in accordance with the Building Code. 

1106.6 Exterior openings. Openings in exterior walls of 
machinery rooms shall not be located under any exit, stairway 
or exit discharge. 

1106.7 Egress. Each machinery room shall be provided with a 
minimum of one exit door that opens directly to the outside. 

Exception: Self-closing, tight-fitting doors opening into a 
vestibule leading directly outside. 



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REFRIGERATION 



1106.8 Ammonia room ventilation. Ventilation systems in 
ammonia machinery rooms shall lie operated continuously at 
the emergency ventilation rate determined in accordance with 
Section 1105.8.4. 

Exceptions: 

1 . Machinery rooms equipped with a vapor detector that 
will automatically start the ventilation system at the 
emergency rate determined in accordance with Sec- 
tion 1 105. 8.4, and that will actuate an alarm at a detec- 
tion level not to exceed 1-000 ppm; or 

2. Machinery rooms conforming to the Class 1 , Division 
2, hazardous location classification requirements of 
NFPA 70. 

1106.9 Flammable refrigerants. Where refrigerants of 
Groups A2, A3, B2 and B3 are used, the machinery room shall 
conform to the Class 1, Division 2, hazardous location classifi- 
cation requirements of the Electrical Code. 

Exception: Ammonia machinery rooms. 

1106.10 Remote controls. Remote control of the mechanical 
equipment and appliances located in the machinery room shall 
be provided at an approved location immediately outside the 
machinery room and adjacent to its principal entrance. 

1106.10.1 Refrigeration system. A clearly identified 
switch of the break- glass type shall provide off-only control 
of electrically energized equipment and appliances in the 
machinery room, other than refrigerant leak detectors and 
machinery room ventilation. 

Exception: In machinery rooms where only nonflam- 
mable refrigerants are used, electrical equipment and 
appliances, other than compressors, are not required to 
be provided with a cutoff switch. 

1106.10.2 Ventilation system. A clearly identified switch 
of the break-glass type shall provide on-only control of the 
machinery room ventilation fans. 

1106.11 Emergency signs and labels. Refrigeration units and 
systems shall be provided with approved emergency signs, 
charts, and labels in accordance with the Fire Code. 



SECTION 1107 
REFRIGERANT PIPING 

1107.1 General. All refrigerant piping shall be installed, tested 
and placed in operation in accordance with this chapter. 

1107.2 Pipe enclosures. Rigid or flexible metal enclosures or 
pipe ducts shall be provided for soft, annealed copper tubing 
and used for refrigerant piping erected on the premises and 
containing other than Group Al or B 1 refrigerants. Enclosures 
shall not be required for connections between condensing units 
and the nearest riser box(es), provided such connections do not 
exceed 6 feet (1829 mm) in length. 

1107.3 Condensation. All refrigerating piping and fittings, 
brine piping and fittings that, during normal operation, will 
reach a surface temperature below the dew point of the sur- 
rounding air, and are located in spaces or areas where conden- 



sation will cause a safety hazard to the building occupants, 
structure, electrical equipment or any other equipment or appli- 
ances, shall be protected in an approved manner to prevent such 
damage. 

1107.4 Materials for refrigerant pipe and tubing. Piping 
materials shall be as set forth in Sections 1107.4.1 through 

1107.4.5. 

1107.4.1 Steel pipe. Carbon steel pipe with a wall thickness 
not less than Schedule 80 shall be used for Group A2, A3, 
B2 or B3 refrigerant liquid lines for sizes 1.5 inches (38 
mm) and smaller. Carbon steel pipe with a wall thickness 
not less than Schedule 40 shall be used for Group Al or Bl 
refrigerant liquid lines 6 inches (152 nmi) and smaller. 
Group A2, A3, B2 or B3 refrigerant liquid lines sizes 2 
inches (51 mm) through 6 inches (152 mm) and all refriger- 
ant suction and discharge lines 6 inches (152 mm) and 
smaller. Type F steel pipe shall not be used for refrigerant 
lines having an operating temperature less than -20°F 
(-29°C). 

1107.4.2 Copper and brass pipe. Standard iron-pipe size, 
copper and red brass (not less than 80-percent copper) pipe 
shall conform to ASTM B 42 and ASTM B 43. 

1107.4.3 Copper tube. Copper tube used for refrigerant 
piping erected on the premises shall be seamless copper 
tube of Type ACR (hard or annealed) complying with 
ASTM B 280. Where approved, copper tube for refrigerant 
piping erected on the premises shall be seamless copper 
tube of Type K, L or M (drawn or annealed) in accordance 
with ASTM B 88. Annealed temper copper tube shall not be 
used in sizes larger than a 2-inch (51 mm) nominal size. 
Mechanical joints shall not be used on annealed temper cop- 
per tube in sizes larger than 7/8-inch (22.2 mm) OD size. 

1107.4.4 Copper tubing joints. Copper tubing joints used 
in refrigerating systems containing Group A2, A3, B2 or B3 
refrigerants shall be brazed. Soldered joints shall not be 
used in such refrigerating systems. 

1107.4.5 Aluminum tube. Type 3003-0 aluminum tubing 
with high-pressure fittings shall not be used with methyl 
chloride and other refrigerants known to attack aluminum. 

1107.5 Joints and refrigerant-containing parts in air ducts. 

Joints and all refrigerant-containing parts of a refrigerating 
system located in an air duct of an air-conditioning system car- 
rying conditioned air to and from human-occupied space shall 
be constructed to withstand, without leakage, a pressure of 150 
percent of the higher of the design pressure or pressure relief 
device setting. 

1107.6 Exposure of refrigerant pipe joints. Refrigerant pipe 
joints erected on the premises shall be exposed for visual 
inspection prior to being covered or enclosed. 

1107.7 Stop valves. All systems containing more than 6.6 
pounds (3 kg) of a refrigerant in systems using positive-dis- 
placement compressors shall have stop valves installed as fol- 
lows: 

I. At the inlet of each compressor, compressor unit or con- 
densing unit. 



2007 OREGON MECHANICAL SPECIALTY CODE 



93 



REFRIGERATION 



2. At the discharge outlet of each compressor, compressor 
unit or condensing unit and of each liquid receiver. 

Exceptioms: 

1. Systems that have a refrigerant pumpout function 
capable of storing the entire refrigerant charge in a 
receiver or heat exchanger. 

2. Systems that are equipped with provisions for 
pumpout of the refrigerant using either portable or 
permanently installed recovery equipment. 

3. Self-contained systems. 



IJA Liquid receivers. All systems containing 100 
pounds (45 kg) or more of a refrigerant, other than systems 
utilizing nonpositive displacement compressors, shall have 
stop valves, in addition to those required by Section 1 107.7, 
on each inlet of each liquid receiver. Stop valves shall not be 
required on the inlet of a receiver in a condensing unit, nor 
on the inlet of a receiver which is an integral part of the con- 
denser. 



L12 Copper tubing. Stop valves used with soft 
annealed copper tubing or hard-drawn copper tubing 
Vg-inch (22.2 mm) OD standard size or smaller shall be 
securely mounted, independent of tubing fastenings or sup- 
ports. 

1107,7,3 Identification, Stop valves shall be identified 
where their intended purpose is not obvious. Numbers shall 
not be used to label the valves, unless a key to the numbers is 
located near the valves. 



SECTION 
FIELD TEST 

1108,1 General, Every refrigerant-containing part of every 
system that is erected on the premises, except compressors, 
condensers, vessels, evaporators, safety devices, pressure 
gauges and control mechanisms that are listed and factory 
tested, shall be tested and proved tight after complete installa- 
tion, and before operation. Tests shall include both the high- 
and low-pressure sides of each system at not less than the lower 
of the design pressures or the setting of the pressure relief 
device(s). The design pressures for testing shall be those listed 
on the condensing unit, compressor or compressor unit 
name-plate, as required by ASHRAE 15. 

Exceptions; 

1 . Gas bulk storage tanks that are not permanently con- 
nected to a refrigeration system. 

2. Systems erected on the premises with copper tubing 
not exceeding Vg-inch (15.8 mm) OD, with wall 
thickness as required by ASHRAE 15, shall be tested 
in accordance with Section 1108.1, or by means of 
refrigerant charged into the system at the saturated 
vapor pressure of the refrigerant at 70°F (21°C) or 
higher. 

3. Limited-charge systems equipped with a pressure 
relief device, erected on the premises, shall be tested 
at a pressure not less than one and one-half times the 
pressure setting of the relief device. If the equipment 



or appliance has been tested by the manufacturer at 
one and one-half times the design pressure, the test 
after erection on the premises shall be conducted at 
the design pressure. 

1108.1,1 Booster compressor. Where a compressor is used 
as a booster to obtain an intermediate pressure and dis- 
charges into the suction side of another compressor, the 
booster compressor shall be considered a part of the low 
side, provided that it is protected by a pressure relief device. 

1108.. 1.2 Centrifugal/nonpositive displacement com- 
pressors. In field-testing systems using centrifugal or other 
nonpositive displacement compressors, the entire system 
shall be considered as the low-side pressure for field test 
purposes. 

1108.2 Test gases. Tests shall be performed with an inert dried 
gas including, but not limited to, nitrogen and carbon dioxide. 
Oxygen, air, combustible gases and mixtures containing such 
gases shall not be used. 

Exception: The use of air is allowed to test R-717, ammo- 
nia, systems provided that they are subsequently evacuated 
before charging with refrigerant. 

1108.3 Test apparatus. The means used to build up the test 
pressure shall have either a pressure-limiting device or a pres- 
sure-reducing device and a gauge on the outlet side. 

1108.4 Declaration. A certificate of test shall be provided for 
all systems containing 55 pounds (25 kg) or more of refriger- 
ant. The certificate shall give the name of the refrigerant and the 
field test pressure applied to the high side and the low. side of 
the system. The certification of test shall be signed by the 
installer and shall be made part of the public record. 



< 



94 



2007 OREGON MECHANICAL SPECIALTY CODE 



CHAPTER 12 

HYDRONIC PIPING 



SECTION 1201 
GENERAL 

L.l Scope. The provisions of this chapter shall govern the 
construction, installation, alteration and repair of hydronic pip- 
ing systems. This chapter shall apply to hydronic piping sys- 
tems that are part of heating, ventilation and air-conditioning 
systems. Such piping systems shall include steam, hot water, 
chilled water, steam condensate and ground source heat pump 
loop systems. Potable cold and hot water distribution systems 
shall be installed in accordance with the Plumbing Code. 

1201.2 Pipe sizing. Piping for hydronic systems shall be sized 
for the demand of the system. 



SECTION 1202 
MATERIAL 

1202.1 Piping. Piping material shall conform to the standards 
cited in this section. 

Exception: Embedded piping regulated by Section 1209. 

1202.2 Used materials. Reused pipe, fittings, valves or other 
materials shall be clean and free of foreign materials and shall 
be approved by the code official for reuse. 

1202.3 Material rating. Materials shall be rated for the operat- 
ing temperature and pressure of the hydronic system. Materials 
shall be suitable for the type of fluid in the hydronic system. 

1202.4 Piping materials standards. Hydronic pipe shall con- 
form to the standards listed in Table 1202.4. The exterior of the 
pipe shall be protected from corrosion and degradation. 



TABLE 1202.4 
HYDRONIC PIPE 



MATERIAL 


STANDARD (see Chapter 15) 


Acrylonitrile butadiene styrene 
(ABS) plastic pipe 


ASTM D 1527; ASTM D 2282 


Brass pipe 


ASTM B 43 


Brass tubing 


ASTM B 135 


Copper or copper-alloy pipe 


ASTM B 42; ASTM B 302 


Copper or copper-alloy tube 
(Type K, L or M) 


ASTM B 75; ASTM B 88; 
ASTM B 251 


Chlorinated polyvinyl chloride 
(CPVC) plastic pipe 


ASTM D 2846; ASTM F 441; 
ASTM F 442 


Cross-linked polyethylene/ 
aluminum/cross-linked 
polyethylene (PEX-AL-PEX) 
pressure pipe 


ASTM F 1281; 

CSACAN/CSA-B-137.10 


Cross-linked polyethylene 
(PEX) tubing 


ASTM F 876; ASTM F 877 



TABLE 1202.4— continued 
HYDRONIC PIPE 



MATERIAL 


STANDARD (see Chapter 15) 


Lead pipe 


FS WW-P-325B 


Polybutylene (PB) plastic pipe 
and tubing 


ASTM D 3309 


Polyethylene (PE) pipe, tubing 
and fittings (for ground source 
heat pump loop systems) 


ASTM D 25 1 3 ; ASTM D 3035 ; 
ASTM D 2447; ASTM D 2683; 
ASTM F 1055; ASTM D 2837; 
ASTM D 3350; ASTM D 1 693 


Polyvinyl chloride (PVC) 
plastic pipe 


ASTM D 1785; ASTM D 2241 


Steel pipe 


ASTM A 53; ASTM A 106 


Steel tubing 


ASTM A 254 



1202.5 Pipe fittings. Hydronic pipe fittings shall be approved 
for installation with the piping materials to be installed, and 
shall conform to the respective pipe standards or to the stan- 
dards listed in Table 1202.5. 

TABLE 1202.5 
HYDRONIC PIPE FITTINGS 



MATERIAL 


STANDARD (see Chapter 15) 


Brass 


ASTM F 1974 


Bronze 


ASMEB 16.24 


Copper and copper alloys 


ASME B16.15; ASME B16.18; 
ASMEB 16.22; ASMEB 16.23; 
ASME B16.26; ASME B16.29 


Gray iron 


ASTM A 126 


Malleable iron 


ASMEB 16.3 


Plastic 


ASTM D 2466; ASTM D 2467; 
ASTM D 2468; ASTM F 438; 
ASTM F 439; ASTM F 877 


Steel 


ASME B16.5; ASME B16.9; 
ASME B16.il; ASME B16.28; 

ASTM A 420 



1202.6 Valves. Valves shall be constructed of materials that are 
compatible with the type of piping material and fluids in the 
system. Valves shall be rated for the temperatures and pres- 
sures of the systems in which the valves are installed. 

1202.7 Flexible connectors, expansion and vibration com- 
pensators. Flexible connectors, expansion and vibration con- 
trol devices and fittings shall be of an approved type. 



(continued) 



2007 OREGON MECHANICAL SPECIALTY CODE 



95 



HYDRONIC PIPING 



IECT80N 1203 
S AND CONNECTIONS 

1203,1 Approval. Joints and connections shall be of an 
approved type. Joints and connections shall be tight for the 
pressure of the hydronic system. 



LI Joints between different piping materials. 
Joints between different piping materials shall be made with 
approved adapter fittings. Joints between different metallic 
piping materials shall be made with approved dielectric fit- 
tings or brass converter fittings. 

12<D)3.2 Preparation of pipe ends. Pipe shall be cut square, 
reamed and chamfered, and shall be free of burrs and obstruc- 
tions. Pipe ends shall have full-bore openings and shall not be 
undercut. 

1203.3 Joint preparation and installation. When required by 
Sections 1203.4 through 1203.14, the preparation and installa- 
tion of brazed, mechanical, soldered, solvent-cemented, 
threaded and welded joints shall comply with Sections 
1203.3.1 through 1203.3.7. 

1203.3.1 Brazed joints. Joint surfaces shall be cleaned. An 
approved flux shall be applied where required. The joint 
shall be brazed with a filler metal conforming to AWS A5.8. 

1203.3.2 Mechanical joints. Mechanical joints shall be 
installed in accordance with the manufacturer's instruc- 
tions. 

1203.3.3 Soldered joints. Joint surfaces shall be cleaned. A 
flux conforming to ASTM B 813 shall be applied. The joint 
shall be soldered with a solder conforming to ASTM B 32. 

1203.3.4 Solvent-cemented Joints. Joint surfaces shall be 
clean and free of moisture. An approved primer shall be 
applied to CPVC and PVC pipe-joint surfaces. Joints shall 
be made while the cement is wet. Solvent cement conform- 
ing to the following standards shall be applied to all joint 
surfaces: 

1. ASTM D 2235 for ABS joints. 

2. ASTM F 493 for CPVC joints. 

3. ASTM D 2564 for PVC joints. 

CPVC joints shall be made in accordance with ASTM D 
2846. 



5.3.5 Threaded joints. Threads shall conform to 
ASME B 1 .20. 1 . Schedule 80 or heavier plastic pipe shall be 
threaded with dies specifically designed for plastic pipe. 
Thread lubricant, pipe -joint compound or tape shall be 
applied on the male threads only and shall be approved for 
application on the piping material. 

1203.3.6 Welded joints. Joint surfaces shall be cleaned by 
an approved procedure. Joints shall be welded with an 
approved filler metal. 

1203.3.7 Grooved and stoouldered meclnanical joints. 
Grooved and shouldered mechanical joints shall conform to 
the requirements of ASTM F 1476 and shall be installed in 
accordance with the manufacturer's installation instruc- 
tions. 



1203.3.8 Mechanically formed tee fittings. Mechanically 
extracted outlets shall have a height not less than three times 
the thickness of the branch tube wall. 

1203.3.8.1 Full flow assurance. Branch tubes shall not 
restrict the flow in the run tube. A dimple/depth stop 
shall be formed in the branch tube to ensure that penetra- 
tion into the outlet is of the correct depth. For inspection 
pui-poses, a second dimple shall be placed 0.25 inch (6.4 
mm) above the first dimple. Dimples shall be aligned 
with the tube run. 

1203.3.8.2 Brazed joints. Mechanically formed tee fit- 
tings shall be brazed in accordance with Section 
1203.3.1. 

1203.4 ABS plastic pipe. Joints between ABS plastic pipe or 
fittings shall be solvent-cemented or threaded joints conform- 
ing to Section 1203.3. 

1203.5 Brass pipe. Joints between brass pipe or fittings shall 
be brazed, mechanical, threaded or welded joints conforming 
to Section 1203.3. 

1203.6 Brass tubing. Joints between brass tubing or fittings 
shall be brazed, mechanical or soldered joints conforming to 
Section 1203.3. 

1203.7 Copper or copper-alloy pipe. Joints between copper 
or copper-alloy pipe or fittings shall be brazed, mechanical, 
soldered, threaded or welded joints conforming to Section 
1203.3. 

1203.8 Copper or copper-alloy tubing. Joints between cop- 
per or copper-alloy tubing or fittings shall be brazed, mechani- 
cal or soldered joints conforming to Section 1203.3 or flared 
joints conforming to Section 1203.8.1. 

1203.8,1 Flared joints. Flared joints shall be made by a tool 
designed for that operation. 

1203.9 CPVC plastic pipe. Joints between CPVC plastic pipe 
or fittings shall be solvent-cemented or threaded joints con- 
forming to Section 1203.3. 

1203.10 Polybutylene plastic pipe and tubing. Joints 
between polybutylene plastic pipe and tubing or fittings shall 
be mechanical joints conforming to Section 1203.3 or 
heat-fusion joints conforming to Section 1203.10.1. 

1203.10.1 Heat-fusion joints. Joints shall be of the 
socket-fusion or butt-fusion type. Joint surfaces shall be 
clean and free of moisture. Joint surfaces shall be heated to 
melt temperatures and joined. The joint shall be undisturbed 
until cool. Joints shall be made in accordance with ASTM D 
3309. 

1203.11 Cross-linked polyethylene (PEX) plastic tubing. 
Joints between cross-linked polyethylene plastic tubing and fit- 
tings shall conform to Sections 1203.11.1 and 1203.11.2. 
Mechanical joints shall conform to Section 1203.3. 

1203.11.1 Compression-type Ottings, When compres- 
sion-type fittings include inserts and ferrules or 0-rings, the 
fittings shall be installed without omitting the inserts and 
ferrules or 0-rings. 

1203.11.2 Plastic-to-metal connections. Soldering on the 
metal jjortion of the system shall be performed at least 1 8 



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HYDRONIC PIPING 



inches (457 mm) from a plastic-to-metal adapter in the same 
water line. 

1203.12 PVC plastic pipe. Joints between PVC plastic pipe 
and fittings shall be solvent-cemented or threaded joints con- 
forming to Section 1203.3. 

1203.13 Steel pipe. Joints between steel pipe or fittings shall 
be mechanical joints that are made with an approved 
elastomeric seal, or shall be threaded or welded joints conform- 
ing to Section 1203.3. 

1203.14 Steel tubing. Joints between steel tubing or fittings 
shall be mechanical or welded joints conforming to Section 
1203.3. 

1203.15 Polyethylene plastic pipe and tubing for ground 
source heat pump loop systems. Joints between polyethylene 
plastic pipe and tubing or fittings for ground source heat pump 
loop systems shall be heat fusion joints conforming to Section 

1203.15.1, electrofusion joints conforming to Section 

1203.15.2, or stab-type insertion joints conforming to Section 
1203.15.3. 

1203.15.1 Heat-fusion joints. Joints shall be of the 
socket-fusion, saddle-fusion or butt-fusion type, fabricated 
in accordance with the piping manufacturer's instructions. 
Joint surfaces shall be clean and free of moisture. Joint sur- 
faces shall be heated to melt temperatures and joined. The 
joint shall be undisturbed until cool. Fittings shall be manu- 
factured in accordance with ASTM D 2683. 

1203.15.2 Electrofusion joints. Joints shall be of the 
electrofusion type. Joint surfaces shall be clean and free of 
moisture, and scoured to expose virgin resin. Joint surfaces 
shall be heated to melt temperatures for the period of time 
specified by the manufacturer. The joint shall be undis- 
turbed until cool. Fittings shall be manufactured in accor- 
dance with ASTM F 1055. 

1203.15.3 Stab-type insert fittings. Joint surfaces shall be 
clean and free of moisture. Pipe ends shall be chamfered and 
inserted into the fittings to full depth. Fittings shall be manu- 
factured in accordance with ASTM D 2513. 



SECTION 1204 
PIPE INSULATION 

1204.1 Insulation characteristics. Pipe insulation installed in 
buildings shall conform to the requirements of the Building 
Code, shall be tested in accordance with ASTM E 84, using the 
specimen preparation and mounting procedures of ASTM E 
223 1 ; and shall have a maximum flame spread index of 25 and a 
smoke-developed index not exceeding 450. Insulation installed 
in an air plenum shall comply with Section 602.2.1. 

Exception: The maximum flame spread index and smoke- 
developed index shall not apply to one- and two-family 
dwellings. 

1204.2 Required thickness. Hydronic piping shall be insu- 
lated to the thickness required by the Building Code. 



SECTION 1205 
VALVES 

1205.1 Where required. Shutoff valves shall be installed in 
hydronic piping systems in the locations indicated in Sections 
1205.1.1 through 1205.1.6. 

1205.1.1 Heat exchangers. Shutoff valves shall be 
installed on the supply and return side of a heat exchanger. 

Exception: Shutoff valves shall not be required when 
heat exchangers are integral with a boiler; or are a com- 
ponent of a manufacturer's boiler and heat exchanger 
packaged unit and are capable of being isolated from the 
hydronic system by the supply and return valves. 

1205.1.2 Central systems. Shutoff valves shall be installed 
on the building supply and return of a central utility system. 

1205.1.3 Pressure vessels. Shutoff valves shall be installed 
on the connection to any pressure vessel. 

1205.1.4 Pressure-reducing valves. Shutoff valves shall 
be installed on both sides of a pressure-reducing valve. 

1205.1.5 Equipment and appliances. Shutoff valves shall 
be installed on connections to mechanical equipment and 
appliances. This requirement does not apply to components 
of a hydronic system such as pumps, air separators, meter- 
ing devices and similar equipment. 

1205.1.6 Expansion tanks. Shutoff valves shall be 
installed at connections to nondiaphragm-type expansion 
tanks. 

1205.2 Reduced pressure. A pressure relief valve shall be 
installed on the low-pressure side of a hydronic piping system 
that has been reduced in pressure. The relief valve shall be set at 
the maximum pressure of the system design. The valve shall be 
installed in accordance with Section 1008. 



SECTION 1206 
PIPING INSTALLATION 

1206.1 General. Piping, valves, fittings and connections shall 
be installed in accordance with the conditions of approval. 

1206.1.1 Prohibited tee applications. Fluid in the supply 
side of a hydronic system shall not enter a tee fitting through 
the branch opening. 

1206.2 System drain down. Hydronic piping systems shall be 
designed and installed to permit the system to be drained. 
Where the system drains to the plumbing drainage system, the 
installation shall conform to the requirements of the Plumbing 
Code. 

1206.3 Protection of potable water. The potable water system 
shall be protected from backflow in accordance with the 
Plumbing Code. 

1206.4 Pipe penetrations. Openings for pipe penetrations in 
walls, floors or ceilings shall be larger than the penetrating 
pipe. Openings through concrete or masonry building elements 
shall be sleeved. The annular space surrounding pipe penetra- 
tions shall be protected in accordance with the Building Code. 



< 



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HYDRONIC PIPING 



>l I 



1206.5 Clearance to combestibles. A pipe in a hydronic pip- 
ing system in which the exterior temperature exceeds 250°F 
(121°C) shall have a minimum clearance of 1 inch (25 mm) to 
combustible materials. 

1206.6 Contact with building material. A hydronic piping 
system shall not be in direct contact with building materials 
that cause the piping material to degrade or corrode, or that 
interfere with the operation of the system. 

1206.7 Water hammen The flow velocity of the hydronic pip- 
ing system shall be controlled to reduce the possibility of water 
hammer. Where a quick-closing valve creates water hammer, 
an approved water-hammer arrestor shall be installed. The 
arrestor shall be located within a range as specified by the man- 
ufacturer of the quick-closing valve. 

1206.8 Steam piping pitch. Steam piping shall be installed to 
drain to the boiler or the steam trap. Steam systems shall not 
have drip pockets that reduce the capacity of the steam piping. 



5.9 Strains and stresses. Piping shall be installed so as to 
prevent detrimental strains and stresses in the pipe. Provisions 
shall be made to protect piping from damage resulting from 
expansion, contraction and structural settlement. Piping shall 
be installed so as to avoid structural stresses or strains within 
building components. 

1206,9.1 Flood hazard. Piping located in a flood hazard 
area shall be capable of resisting hydrostatic and hydrody- 
namic loads and stresses, including the effects of buoyancy, 
during the occurrence of flooding to the design flood eleva- 
tion. 

1206.10 Pipe support. Pipe shall be supported in accordance 
with Section 305. 

1206.11 Condensation. Provisions shall be made to prevent 
the formation of condensation on the exterior of piping. 



SECTION 1207 
TRANSFER FLUID 

1207.1 Flash point. The flash point of transfer fluid in a 
hydronic piping system shall be a minimum of 50°F (28°C) 
above the maximum system operating temperature. 

1207.2 Makeup water. The transfer fluid shall be compatible 
with the makeup water supplied to the system. 



SECTION 1208 
TESTS 

1208,1 General. Hydronic piping systems shall be tested 
hydrostatically at one and one half times the maximum system 
design pressure, but not less than 100 psi (689 kPa). The dura- 
tion of each test shall be not less than 15 minutes. 
Ground-source heat pump loop systems and cross-linked poly- 
ethylene (PEX) tubing systems shall be tested in accordance 
with Sections 1208.1.1 and 1208.1.2. 

1208.1.1 Ground source heat pump loop systems. Before 
connection (header) trenches are backfilled, the assembled 
loop system shall be pressure tested with water at 100 psi 
(689 kPa) for 30 minutes with no observed leaks. Flow and 



pressure loss testing shall be performed and the actual flow 
rates and pressure drops shall be compared to the calculated 
design values. If actual flow rate or pressure drop values dif- 
fer from calculated design values by more than 10 percent, 
the problem shall be identified and corrected. 

1208.1.2 Cross-linked polyethylene (PEX) tubing sys- 
tems. Before a continuous looped systems using PEX tub- 
ing is embedded or concealed, the assembled system shall 
be pressure tested at 100 psi (689 kPa) for 30 minutes with 
no observed leaks. 



SECTION 1209 



Piping for heating panels shall be stan- 
dard-weight steel pipe, Type L copper tubing, cross-linked 
polyethylene (PEX) tubing, cross-linked polyethylene/alumi- 
num/cross-linked polyethylene (PEX-AL-PEX) pressure pipe 
or polybutylene rated at 100 psi (689 kPa) at 180°F (82°C). 



1209.2 Pressurizing during installation. Piping to be embed- 
ded in concrete shall be pressure tested prior to pouring con- 
crete. During pouring, the pipe shall be maintained at the 
proposed operating pressure. 

1209.3 Embedded joints. Joints of pipe or tubing that are 
embedded in a portion of the building, such as concrete or plas- 
ter, shall be in accordance with the requirements of Sections 
1209.3.1 through 1209.3.5. 

1209.3.1 Steel pipe joints. Steel pipe shall be welded by 
electrical arc or oxygen/acetylene method. 

1209.3.2 Copper tubing joints. Copper tubing shall be 
joined by brazing with filler metals having a melting point 
of not less than 1,000°F (538°C). 

1209.3.3 Polybutylene joints. Polybutylene pipe and tub- 
ing shall be installed in continuous lengths or shall be joined 
by heat fusion in accordance with Section 1203.10.1. 

1209.3.4 Cross-linked polyethylene joints. PEX pipe shall 
be joined using cold expansion, insert or compression fit- 
tings. 



,5 Cross-linked polyet 
linked polyethylene. PEX-AL-PEX pipe shall be joined by 
mechanical, crimp/insert fittings. 

1209.4 Not embedded related piping. Joints of other piping in 
cavities or running exposed shall be joined by approved meth- 
ods in accordance with manufacturer's installation instructions 
and related sections of this code. 



II 



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2007 OREGON WiECHANICAL SPECIALTY CODE 



CHAPTER 13 

FUEL OIL PIPING AND STORAGE 



SECTION 1301 
GENERAL 

1301.1 Scope. This chapter shall govern the design, installa- 
tion, construction and repair of fuel-oil storage and piping sys- 

> terns. 

1301.2 Storage and piping systems. Fuel-oil storage systems 
shall comply with Section 603.3 of the Fire Code. Fuel-oil pip- 
ing systems shall comply with the requirements of this code 

I I and the Oregon Department of Environmental Quality (DEQ) . 

1301.3 Fuel type. An appliance shall be designed for use with 
the type of fuel to which it will be connected. Such appliance 
shall not be converted from the fuel specified on the rating plate 
for use with a different fuel without securing reapproval from 
the code official. 

1301.4 Fuel tanks, piping and valves. The tank, piping and 
valves for appliances burning oil shall be installed in accor- 
dance with the requirements of this chapter. When an oil burner 
is served by a tank, any part of which is above the level of the 
burner inlet connection and where the fuel supply line is taken 
from the top of the tank, an approved antisiphon valve or other 
siphon-breaking device shall be installed in lieu of the shutoff 
valve. 

1301.5 Tanks abandoned or removed. All exterior 
above-grade fill piping shall be removed when tanks are aban- 
doned or removed. Tank abandonment and removal shall be in 
accordance with Section 3404.2.13 of the Fire Code. 



SECTION 1302 
MATERIAL 

1302.1 General. Piping materials shall conform to the stan- 
dards cited in this section. 

1302.2 Rated for system. All materials shall be rated for the 
operating temperatures and pressures of the system, and shall 
be compatible with the type of liquid. 

1302.3 Pipe standards. Fuel oil pipe shall comply with one of 
the standards listed in Table 1302.3. 

1302.4 Nonmetallic pipe. All nonmetallic pipe shall be listed 
and labeled as being acceptable for the intended application for 
flammable and combustible liquids. Nonmetallic pipe shall be 
installed only outside, underground. 

1302.5 Fittings and valves. Fittings and valves shall be 
approved for the piping systems, and shall be compatible with, 
or shall be of the same material as, the pipe or tubing. 

1302.6 Bending of pipe. Pipe shall be approved for bending. 
Pipe bends shall be made with approved equipment. The bend 
shall not exceed the structural limitations of the pipe. 



TABLE 1302.3 
FUEL OIL PIPING 



MATERIAL 


STANDARD (see Chapter 15) 


Brass pipe 


ASTM B 43 


Brass tubing 


ASTMB 135 


Copper or copper-alloy pipe 


ASTM B 42; ASTM B 302 


Copper or copper-alloy 
tubing 
(Type K, L or M) 


ASTM B 75; ASTM B 88; 
ASTM B 280 


Labeled pipe 


(See Section 1302.4) 


Nonmetallic pipe 


ASTM D 2996 


Steel pipe 


ASTM A 53; ASTM A 106 


Steel tubing 


ASTM A 254; ASTM A 539 



1302.7 Pumps. Pumps that are not part of an appliance shall be 
of a positive-displacement type. The pump shall automatically 
shut off the supply when not in operation. Pumps shall be listed 
and labeled in accordance with UL 343. 

1302.8 Flexible connectors and hoses. Flexible connectors 
and hoses shall be listed and labeled in accordance with UL 
536. 



SECTION 1303 
JOINTS AND CONNECTIONS 

1303.1 Approval. Joints and connections shall be approved 
and of a type approved for fuel-oil piping systems. All threaded 
joints and connections shall be made tight with suitable lubri- 
cant or pipe compound. Unions requiring gaskets or packings, 
right or left couplings, and sweat fittings employing solder 
having a melting point of less than 1 ,000°F (538°C) shall not be 
used in oil lines. Cast-iron fittings shall not be used. Joints and 
connections shall be tight for the pressure required by test. 

1303.1.1 Joints between different piping materials. 

Joints between different piping materials shall be made with 
approved adapter fittings. Joints between different metallic 
piping materials shall be made with approved dielectric fit- 
. tings or brass converter fittings. 

1303.2 Preparation of pipe ends. All pipe shall be cut square, 
reamed and chamfered and be free of all burrs and obstructions. 
Pipe ends shall have full-bore openings and shall not be under- 
cut. 

1303.3 Joint preparation and installation. Where required 
by Sections 1303.4 through 1303.10, the preparation and 
installation of brazed, mechanical, threaded and welded joints 
shall comply with Sections 1303.3.1 through 1303.3.4. 



2007 OREGON MECHANICAL SPECIALTY CODE 



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FUEL OIL PDPDNG AND STORAGE 



.3.1 Brazed joints. All joint surfaces shall be cleaned. 
An approved flux shall be applied where required. The 
joints shall be brazed with a filler metal conforming to AWS 
A5.8. 



5.3.2 Mechanical joints. Mechanical joints shall be 
installed in accordance with the manufacturer's instruc- 
tions. 



Threads shall conform to 
ASME B 1.20.1. Pipe-joint compound or tape shall be 
applied on the male threads only. 



.3.4 Welded joints. All joint surfaces shall be cleaned 
by an approved procedure. The joint shall be welded with an 
approved filler metal. 



.4 Brass pipe. Joints between brass pipe or fittings shall 
be brazed, mechanical, threaded or welded joints complying 
with Section 1303.3. 



5.5 Brass tubing. Joints between brass tubing or fittings 
shall be brazed or mechanical joints complying with Section 
1303.3. 

1303.6 Copper or copper-alloy pipe. Joints between copper 
or copper-alloy pipe or fittings shall be brazed, mechanical, 
threaded or welded joints complying with Section 1303.3. 



.7 Copper or copper-alloy tubing. Joints between cop- 
per or copper-alloy tubing or fittings shall be brazed or 
mechanical joints complying with Section 1303.3 or flared 
joints. Flared joints shall be made by a tool designed for that 
operation. 

1303.8 Nonmetallic pipe. Joints between nonmetallic pipe or 
fittings shall be installed in accordance with the manufacturer's 
instructions for the labeled pipe and fittings. 



pipe. Joints between steel pipe or fittings shall be 
threaded or welded joints complying with Section 1303.3 or 
mechanical joints complying with Section 1303.9.1. 

1303,9.1 Mechanical joints. Joints shall be made with an 
approved elastomeric seal. Mechanical joints shall be 
installed in accordance with the manufacturer's instruc- 
tions. Mechanical joints shall be installed outside, under- 
ground, unless otherwise approved. 



D) Steel tubing. Joints between steel tubing or fittings 
shall be mechanical or welded joints complying with Section 
1303.3. 

1303.11 Piping protection. Proper allowance shall be made 
for expansion, contraction, jarring and vibration. Piping other 
than tubing, connected to underground tanks, except straight 
fill lines and test wells, shall be provided with flexible connec- 
tors, or otherwise arranged to permit the tanks to settle without 
impairing the tightness of the piping connections. 



1304.1 General. Pipe supports shall be in accordance with 
Section 305. 



SECTION 1305 
FUEL OIL SYSTEM INSTALLATION 

1305.1 Size. The fuel oil system shall be sized for the maxi- 
mum capacity of fuel oil required. The minimum size of a sup- 
ply Une shall be 3/8-inch (9.5 mm) inside diameter nominal 
pipe or 3/8-inch (9.5 mm) OD tubing. The minimum size of a 
return line shall be 1/4-inch (6.4 mm) inside diameter nominal 
pipe or 5/16-inch (7.9 mm) outside diameter tubing. Copper 
tubing shall have 0.035-inch (0.9 mm) nominal and 0.032-inch 
(0.8 mm) minimum wall thickness. 

1305.2 Protection of pipe, equipment and appliances. All 
fuel oil pipe, equipment and appliances shall be protected from 
physical damage. 

1305.2.1 Flood hazard. All fuel oil pipe, equipment and 
appliances located in flood hazard areas shall be located 
above the design flood elevation or shall be capable of 
resisting hydrostatic and hydrodynamic loads and stresses, 
including the effects of buoyancy, during the occurrence of 
flooding to the design flood elevation. 

1305.3 Supply piping. Supply piping shall connect to the top 
of the fuel oil tank. Fuel oil shall be supplied by a transfer pump 
or automatic pump or by other approved means. 

Exception: This section shall not apply to inside or 
above-ground fuel oil tanks. 



1305.4 Return piping. Return piping shall connect to the to 
of the fuel oil tank. Valves shall not be installed on return pip 
ing. 

1305.5 System pressure. The system shall be designed for the 
maximum pressure required by the fuel-oil-buming appliance. 
Air or other gases shall not be used to pressurize tanks. 

1305.6 Fill piping. A fill pipe shall terminate outside of a 
building at a point at least 2 feet (610 mm) from any building 
opening at the same or lower level. A fill pipe shall terminate in 
a manner designed to minimize spilling when the filling hose is 
disconnected. Fill opening shall be equipped with a tight metal 
cover designed to discourage tampering. 

1305.7 Vent piping. Liquid fuel vent pipes shall terminate out- 
side of buildings at a point not less than 2 feet (610 mm) mea- 
sured vertically or horizontally from any building opening. 
Outer ends of vent pipes shall terminate in a weatherproof vent 
cap or fitting or be provided with a weatherproof hood. AH vent 
caps shall have a minimum free open area equal to the 
cross-sectional area of the vent pipe and shall not employ 
screens finer than No. 4 mesh. Vent pipes shall terminate suffi- 
ciently above the ground to avoid being obstructed with snow 
or ice. Vent pipes from tanks containing heaters shall be 
extended to a location where oil vapors discharging from the 
vent will be readily diffused. If the static head with a vent pipe 
filled with oil exceeds 10 pounds per square inch (psi) (69 kPa), 
the tank shall be designed for the maximum static head that will 
be imposed. 

Liquid fuel vent pipes shall not be cross connected with fill 
pipes, lines from burners or overflow lines from auxiliary 
tanks. 



100 



2007 OREGON MECHANICAL SPECIALTY CODE 



FUEL OIL PIPING AND STORAGE 



SECTION 1306 
OIL GAUGING 

1306.1 Level indication. All tanks in which a constant oil level 
is not maintained by an automatic pump shall be equipped with 
a method of determining the oil level. 

1306.2 Test wells. Test wells shall not be installed inside build- 
ings. For outside service, test wells shall be equipped with a 
tight metal cover designed to discourage tampering. 

1306.3 Inside tanks. The gauging of inside tanks by means of 
measuring sticks shall not be permitted. An inside tank pro- 
vided with fill and vent pipes shall be provided with a device to 
indicate either visually or audibly at the fill point when the oil 
in the tank has reached a predetermined safe level. 

1306.4 Gauging devices. Gauging devices such as liquid level 
indicators or signals shall be designed and installed so that oil 
vapor will not be discharged into a building from the liquid fuel 
supply system. 

1306.5 Gauge glass. A tank used in connection with any oil 
burner shall not be equipped with a glass gauge or any gauge 
which, when broken, will permit the escape of oil from the 
tank. 



SECTION 1307 
FUEL OIL VALVES 

1307.1 Building shutoff. A shutoff valve shall be installed on 
the fuel-oil supply line at the entrance to the building. Inside or 
above-ground tanks are permitted to have valves installed at the 
tank. The valve shall be capable of stopping the flow of fuel oil 
to the building or to the appliance served where the valve is 
installed at a tank inside the building. 

1307.2 Appliance shutoff. A shutoff valve shall be installed at 
the connection to each appliance where more than one 
fuel-oil-buming appliance is installed. 

1307.3 Pump relief valve. A relief valve shall be installed on 
the pump discharge line where a valve is located downstream of 
the pump and the pump is capable of exceeding the pressure 
limitations of the fuel oil system. 

1307.4 Fuel-oil heater relief valve. A relief valve shall be 
installed on the discharge line of fuel-oil-heating appliances. 

1307.5 Relief valve operation. The relief valve shall discharge 
fuel oil when the pressure exceeds the limitations of the system. 
The discharge line shall connect to the fuel oil tank. 



SECTION 1308 
TESTING 

1308.1 Testing required. Fuel oil piping shall be tested in 
accordance with NFPA 3 1 . 



2007 OREGON MECHANICAL SPECIALTY CODE 



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1 02 2007 OREGON iViECHANJCAL SPECIALTY CODE 



CHAPTER 14 

SOLAR SYSTEMS 




SECTION 1401 
GENERAL 

L.l Scope. This chapter shall govern the design, construc- 
tion, installation, alteration and repair of systems, equipment 
and appliances intended to utilize solar energy for nonpotable 
space heating or cooling, swimming pool heating or process 
heating. 



L.2 Potable water supply. Potable water supplies to solar 
systems shall be protected against contamination in accordance 
with the Plumbing Code. 

Exception: Where all solar system piping is a part of the 
potable water distribution system, in accordance with the 
requirements of the Plumbing Code, and all components of 
the piping system are listed for potable water use, cross-con- 
nection protection measures shall not be required. 



.3 Heat exchangers. Heat exchangers used in domestic 
water-heating systems shall be approved for the intended use. 
The system shall have adequate protection to ensure that the 
potability of the water supply and distribution system is prop- 
erly safeguarded. 

1401.4 Solar energy equipment and appliances. Solar 
energy equipment and appliances shall conform to the require- 
ments of this chapter and shall be installed in accordance with 
the manufacturer's installation instructions. 



L.S Bucts. Ducts utilized in solar heating and cooling sys- 
tems shall be constructed and installed in accordance with 
Chapter 6 of this code. 



SECTION 1402 

INSTALLATION 

LI Access. Access shall be provided to solar energy equip- 
ment and appliances for maintenance. Solar systems and 
appurtenances shall not obstruct or interfere with the operation 
of any doors, windows or other building components requiring 
operation or access. 

1402.2 Protection of equipment. Solar equipment exposed to 
vehicular traffic shall be installed not less than 6 feet (1829 , 
mm) above the finished floor. 

Exception: This section shall not apply where the equip- 
ment is protected fi-om motor vehicle impact. 

1402.3 Controlling condensation. Where attics or structural 
spaces are part of a passive solar system, ventilation of such 
spaces, as required by Section 406, is not required where other 
approved means of controlling condensation are provided. 



.4 Roof-mounted collectors. Roof-mounted solar collec- 
tors that also serve as a roof covering shall conform to the 
requirements for roof coverings in accordance with the Build- 
ing Code. 



Exception: The use of plastic solar collector covers shall be 
limited to those approved plastics meeting the requirements 
for plastic roof panels in the Building Code. 

1402.4.1 Collectors mounted above the roof. When 
mounted on or above the roof covering, the collector array 
and supporting construction shall be constructed of 
noncombustible materials or fire-retardant-treated wood 
conforming to the Building Code to the extent required for 
the type of roof construction of the building to which the 
collectors are accessory. 

Exception: The use of plastic solar collector covers shall 
be limited to those approved plastics meeting the 
requirements for plastic roof panels in the Building 
Code. 

1402.5 Equipment. The solar energy system shall be equipped 
in accordance with the requirements of Sections 1402.5.1 
through 1402.5.4. 

1402.5.1 Pressure and temperature. Solar energy system 
components containing pressurized fluids shall be protected 
against pressures and temperatures exceeding design limi- 
tations with a pressure and temperature relief valve. Each 
section of the system in which excessive pressures are capa- 
ble of developing shall have a relief device located so that a 
section cannot be valved off or otherwise isolated from a 
relief device. Relief valves shall comply with the require- 
ments of the Plumbing Code and discharge in accordance 
with Section 1008. 

1402.5.2 Vacuum. The solar energy system components 
that are subjected to a vacuum while in operation or during, 
shutdown shall be designed to withstand such vacuum or 
shall be protected with vacuum relief valves. 

1402.5.3 Protection from freezing. System components 
shall be protected from damage by freezing of heat transfer 
liquids at the lowest ambient temperatures that will be 
encountered during the operation of the system. 

1402.5.4 Expansion tanks. Liquid single-phase solar 
energy systems shall be equipped with expansion tanks 
sized in accordance with Section 1007. 

1402.6 Penetrations. Roof and wall penetrations shall be 
flashed and sealed to prevent entry of water, rodents and 
insects. 

1402.7 Filtering. Air transported to occupied spaces through 
rock or dust-producing materials by means other than natural 
convection shall be filtered at the outlet from the heat storage 
system. 



SECTION 1403 
HEAT TRANSFER FLUIDS 

1403.1 Flash point. The flash point of the actual heat transfer 
fluid utilized in a solar system shall be not less than 50°F 



2007 OREGON MECHANICAL SPECIALTY CODE 



103 



SOLAR SYSTEWIS 



(28°C) above the design maximum nonoperating (no-flow) 
temperature of the fluid attained in the collector. 

1403.2 Flammatole gases and Mqniids, A flammable liquid or 
gas shall not be utilized as a heat transfer fluid. The flash point 
of liquids used in occupancies classified in Group H or F shall 
not be lower unless approved. 



^TION 1 
WE 



LI Collectors. Factory-built collectors shall be listed and 
labeled, and bear a label showing the manufacturer's name and 
address, model number, collector dry weight, collector maxi- 
mum allowable operating and nonoperating temperatures and 
pressures, minimum allowable temperatures and the types of 
heat transfer fluids that are compatible with the collector. The 
label shall clarify that these specifications apply only to the col- 
lector. 



L2 Thermal storage emits. Pressurized thermal storage 
units shall be listed and labeled, and bear a label showing the 
manufacturer's name and address, model number, serial num- 
ber, storage unit maximum and minimum allowable operating 
temperatures, storage unit maximum and minimum allowable 
operating pressures and the types of heat transfer fluids com- 
patible with the storage unit. The label shall clarify that these 
specifications apply only to the thermal storage unit. 



104 2007 OREGON MECHANICAL SPECIALTY CODE 



CHAPTER 15 

REFERENCED STANDARDS 



This chapter Usts the standards that are referenced in various sections of this document. The standards are listed herein by the pro- 
mulgating agency of the standard, the standard identification, the effective date and title, and the section or sections of this document 
that reference the standard. The application of the referenced standards shall be as specified in Section 102.8. 



ACCA 



Air Conditioning Contractors of America 
1712 New Hampshire Ave, NW 
Washington, DC 20009 



Standard 

Reference 

Number 



Title 



Referenced 

in code 

section number 



Manual D— 95 



Residential Duct Systems 603.2 



ANSI 



American National Standards Institute 
1 1 West 42nd Street 
New York, NY 10036 



Standard 
reference 
number 


Title 


Referenced 

in code 

section number 


Z2 1.8— 1994 


Installation of Domestic Gas Conversion Burners 


919.1 


Z21.83— 1998 


Fuel Cell Power Plants 


924.1 









ARI 



Air-Conditioning and Refrigeration Institute 

Suite 425 

4301 North Fairfax Drive 

Arlington, VA 22203 



Standard 

Reference 

Number 



Title 



Referenced 

in code 

section number 



700—95 



Specifications for Fluorocarbon and Other Refrigerants 1 102.2.2.3 



ASHRAE 



ASHRAE— 2001 
15—2001 
34—2001 
62—2001 



American Society of Heating, Refrigerating 
and Air-Conditioning Engineers, Inc. 
1791 Tullie Cu-cle, NE 
Atlanta, GA 30329-2305 

Title 

ASHRAE Fundamentals Handbook— 2001 603.2 

Safety Standard for Refrigeration Systems 1101.6, 1105.8, 1108.1 

Designation and Safety Classification of Refrigerants 202, 1 102.2.1, 1 103.1 

Ventilation for Acceptable Indoor Air Quality 401.1 



Standard 


- 


Referenced 


Reference 




in code 


Number 


Title 


section number 



ASME 



B 1. 20. 1—1 983 (R 1999) 
B 16.3— 1999 
B 16.5— 1996 
B 16.9— 1993 
B16.il— 1996 



American Society of Mechanical Engineers 

Three Park Avenue 

New York, NY 10016-5990 

Title 

Pipe Threads, General Purpose (Inch) 1203.3.5, 1303.3.3 

Malleable Iron Threaded Fittings, Classes 150 300 Table 1202.5 

Pipe Flanges and Flanged Fittings NPS Vi through NPS 24— With B 16.5a- 1998 Addenda Table 1202.5 

Factory Made Wrought Steel Buttwelding Fittings Table 1202.5 

Forged Fittings, Socket- Welding and Threaded Table 1202.5 



Standard 




Referenced 


Reference 




in code 


Number 


Title 


section number 



2007 OREGON MECHANICAL SPECIALTY CODE 



105 



REFERENCED STANDARDS 



B16.15— 1985(R1994) 
B16.18— 1984(R1994) 
B 16.22— 1995 

B 16.23— 1992 

B 16.24— 1991 {R1998) 

B16.26— 1988 

B 16.28— 1994 

B 16.29— 1994 



ASME— continued 

Cast Bronze Threaded Fittings Table 1202.5 

Cast Copper Alloy Solder Joint Pressure Fittings 513.13.1, Table 1202.5 

Wrought Copper and Copper Alloy Solder Joint Pressure 

Fittings— with B 16.22a- 1998 Addenda 513.13.1, Table 1202.5 

Cast Copper Alloy Solder Joint Drainage Fittings DWV Table 1202.5 

Cast Copper Alloy Pipe Flanges and Flanged Fittings: Class 150, 300, 400, 600, 900, 1500 and 2500 Table 1202.5 

Cast Copper Alloy Fittings for Flared Copper Tubes Table 1202.5 

Wrought Steel Buttwelding Short Radius Elbows and Returns Table 1202.5 

Wrought Copper and Wrought Copper Alloy Solder Joint Drainage Fittings-DWV Table 1202.5 



ASSE 



American Society of Sanitary Engineering 
28901 Clemens Road, Suite A 
Westlake, OH 44145 



Standard 

Reference 

Number 



Title 



Referenced 

in code 

section number 



1017—99 



Performance Requirements for Temperature Actuated Mixing Values 
for Hot Water Distiibution Systems 



.1002.2.2 



ASTM 



ASTM International 

100 Barr Harbor Drive 

West Conshohocken, PA 19428 



Standard 




Referenced 


Reference 




in code 


Number 


Tide 


section number 



A 53/A 53M— 01 

A 106— 99el 
A 126—01 
A 254—97 
A420/A420M— 01 

A 539—99 
B32— 00 
B 42—98 
B 43—98 
B 68—99 
B 75—99 
B 88— 99el 
B 135—00 
B 251—97 
B 280— 99el 

B 302—00 
B 813— OOeOl 
C 315—00 
C 41 1—97 
D56— 01 
D93— 00 
D 1527—99 

D 1693—01 
D 1785—99 
D 2235—01 
D 2241—01 
D 2282—99 
D 24 12— 96a 

D 2447—99 
D 2466—01 



Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded 

and Seamless Table 1202.4, Table 1302.3 

Specification for Seamless Carbon Steel Pipe for High-Temperature Service Table 1202.4, Table 1302.3 

Specification for Gray Iron Castings for Valves, Flanges, and Pipe Fittings Table 1202.5 

Specification for Copper Brazed Steel Tubing Table 1202.4, Table 1302.3 

Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for 

Low-Temperature Service Table 1202.5 

Specification for Electric-Resistance- Welded Coiled Steel Tubing for Gas and Fuel Oil Lines Table 1302.3 

Specification for Solder Metal 1203.3.3 

Specification for Seamless Copper Pipe, Standard Sizes 513.13.1, 1107.4.2, Table 1202.4, Table 1302.3 

Specification for Seamless Red Brass Pipe, Standard Sizes 513.13.1, 1107.4.2, Table 1202.4, Table 1302.3 

Specification for Seamless Copper Tube, Bright Annealed 513.13.1 

Specification for Seamless Copper Tube Table 1202.4, Table 1302.3 

Specification for Seamless Copper Water Tube . . 513.13.1, 1107.4.3, Table 1202.4, Table 1302.3 

Specification for Seamless Brass Tube Table 1202.4, Table 1302.3 

Specification for General Requirements for Wrought Seamless Copper and Copper- Alloy Tube 513.13.1, Table 1202.4 

Specification for Seamless Copper Tube for Air Conditioning and Refrigeration 

Field Service 513.13.1, 1107.4.3, Table 1302.3 

Specification for Threadless Copper Pipe, Standard Sizes Table 1202.4, Table 1302.3 

Specification for Liquid and Paste Fluxes for Soldering of Copper and Copper Alloy Tube 1203.3.3 

Specification for Clay Flue Linings 801.16.1, Table 803.10.4 

Test Method for Hot-Surface Performance of High-Temperature Thermal Insulation 604.3 

Test Method for Flash Point by Tag Closed Tester 202 

Test Method for Flash Point of Pensky-Martens Closed Cup Tester 202 

Specification for Acrylonitrile-Butadiene-Styrene (ABS) Plastic Pipe, 

Schedules 40 and 80 Table 1202.4 

Test Method for Environmental Stress-Cracking of Ethylene Plastics Table 1202.4 

Specification for Poly (Vinyl Chloride)(PVC) Plastic Pipe, Schedules 40, 80 and 120 Table 1202.4 

Specifications for Solvent Cement for Acrylonitrile-Butadiene-Styrene (ABS) Plastic Pipe and Fittings 1203.3.4 

Specification for Poly (Vinyl Chloride)(PVC) Pressure-Rated Pipe (SDR-Series) Table 1202.4 

Specification for Acryloniti-ile-Butadiene-Styrene (ABS) Plastic Pipe (SDR-PR) Table 1202.4 

Test Method for Determination of External Loading Characteristics of Plastic Pipe by 

Parallel-Plate Loading 603.8.3 

Specification for Polyethylene (PE) Plastic Pipe, Schedules 40 and 80, Based on Outside Diameter Table 1202.4 

Specification for Poly (Vinyl Chloride)(PVC) Plastic Pipe Fittings, Schedule 40 Table 1202.5 



• 



106 



2007 OREGON MECHANICAL SPECIALTY CODE 



REFERENCED STANDARDS 



D 2467—01 
D 2468— 96a 
D 2513-00 
D 2564— 96a 
D 2683—98 

D 2837— 98a 

D 2846/D 2846M— 99 

D 2996—00 
D 3035—01 
D3278— 96el 
D 3309— 96a 
D 3350— 01 
E 84—01 

E119— OOe 
E 136— 99e01 
E 814— 00 
F 438— 01 

F 439—01 

F441/F441M— 99 

F 442/F 442M— 99 
F 493—97 

F 876— 01 
F 877—01 

F 1055—98 

F 1281— 01 

F 1974— OOe 



ASTM — continued 

Specification for Poly (Vinyl Chloride)(PVC) Plastic Pipe Fittings, Schedule 80 Table 1202.5 

Specification fpr Acrylonitrile-Butadiene-Styrene (ABS) Plastic Pipe Fittings, Schedule 40 Table 1202.5 

Specification for Thermoplastic Gas Pressure Pipe, Tubing, and Fittings Table 1202.4, 1203.15.3 

Specification for Solvent Cements for Poly (Vinyl Chloride) (PVC) Plastic Piping Systems 1203.3.4 

Specification for Socket-Type Polyethylene Fittings for Outside Diameter-Controlled 

Polyethylene Pipe and Tubing Table 1202.4, 1203.15.1 

Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials Table 1202.4 

Specification for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Hot and Cold Water 

Distribution Systems Table 1202.4, 1203.3.4 

Specification for Filament- Wound Fiberglass (Glass Fiber Reinforced Thermosetting Resin) Pipe Table 1302.3 

Specification for Polyethylene (PE) Plastic Pipe (DR-PR) Based on Controlled Outside Diameter Table 1202.4 

Test Methods for Flash Point of Liquids by Small Scale Closed-Cup Apparatus 202 

Specification for Polybutylene (PB) Plastic Hot- and Cold- Water Distribution Systems Table 1202.4, 1203.10.1 

Specification for Polyethylene Plastics Pipe and Fittings Materials Table 1202.4 

Test Method for Surface Burning Characteristics of Building Materials 202, 510.8, 602.2.1, 602.2.1.5, 

604.3, 1204.1 

Test Method for Fire Tests of Building Construction and Materials 607.5.2, 607.6.2 

Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C 202 

Test Method for Fire Tests of Through-Penetration Fire Stops 506.3. 10 

Specification for Socket Type Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe 

Fittings, Schedule 40 Table 1202.5 

Specification for Socket Type Chlorinated Poly (Vmyl Chloride) (CPVC) Plastic Pipe 

Fittings, Schedule 80 Table 1202.5 

Specification for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe, 

Schedules 40 and 80 Table 1202.4 

Specification for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe (SDR-PR) Table 1202.4 

Specification for Solvent Cements for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic 

Pipe and Fittings 1203.3.4 

Specification for Crosslinked Polyethylene (PEX) Tubing .Table 1202.4 

Specification for Crosslinked Polyethylene (PEX) Plastic Hot and Cold- Water 

Distribution Systems Table 1202.4, Table 1202.5 

Specification for Electrofusion Type Polyethylene Fittings for Outside Diameter 

Controlled Polyethylene Pipe and Tubing .Table 1202.4, 1203.15.2 

Specification for Crosslinked Polyethylene/ Aluminum/Crosslinked Polyethylene 

(PEX-AL-PEX) Pressure Pipe Table 1202.4 

Standard Specification for Metal Insert Fittings for Polyethylene/Aluminum/Polyethylene 

and Crosslinked Polyethylene/Aluminum/Crosshnked Polyethylene Composite Pressure Pipe Table 1202.5 



AWS 



American Welding Society 
550 N.W LeJeune Road 
P.O. Box 351040 
Miami, FL 33135 



Standard 

Reference 

Number 



Title 



Referenced 

in code 

section number 



A5.8— 92 



Specifications for Filler Metals for Brazing and Braze Welding 1203.3.1, 1303.3.1 



CSA 



Canadian Standards Association 

178 Rexdale Blvd. 

Rexdale (Toronto), Ontario, Canada M9W 1R3 



Standard 

Reference 

Number 



Tide 



Referenced 

in code 

section number 



CAN/CSA B137.10M— 99 Crosslinked Polyethylene/ Aluminum/Polyethylene Composite Pressure Pipe Systems Table 1202.4 



2007 OREGON MECHANICAL SPECIALTY CODE 



107 



REFERENCED STANDARDS 



International Institute of Ammonia Refrigeration 

Suite 700 

1101 Connecticut Ave., NW 

Washington, DC 20036 



Standard 

Reference 

Number 



Tide 



Referenced 

in code 

section number 



2—99 



Equipment, Design, and Installation of Ammonia Mechanical Refrigerating Systems 1101.6 



Manufacturers Standardization Society of the Valve Fittings Industry, Inc. 
127 Park Street, N.E. 
Vienna, VA 22180 



Standard 

Reference 

Number 



Title 



Referenced 

in code 

section number 



SP-69— 1996 



Pipe Hangers and Supports — Selection and Application 305.4 



North American Insulation Manufacturers Association 

Suite 310 

44 Canal Center Plaza 

Alexandria, VA 22314 



Standard 

Reference 

Number 



Title 



Referenced 

in code 

section number 



AH116— 02 



Fibrous Glass Duct Construction Standards 603.5, 603.9 



12—00 

13—99 

16—99 

17—98 

17 A— 98 

31—01 

37—98 

58—01 

69—97 

72—99 

82—99 

91—99 

211—00 

262—99 

704—96 

853—00 



National Fire Protection Association 
Batterymarch Park 
Quincy, MA 02269 



Standard 




Referenced 


Reference 




in code 


Number 


Title 


section number 



Carbon Dioxide Extinguishing Systems 509.2 

Installation of Sprinkler Systems 509.2 

Installation of Foam- Water Sprinkler Systems and Foam- Water Spray Systems 509.2 

Dry Chemical Extinguishing Systems 509.2 

Wet Chemical Extinguishing Systems 509.2 

Installation of Oil-Burning Equipment 801.2.1, 801.18.1, 801.18.2, 920.2, 922.1, 1308.1 

Stationary Combustion Engines and Gas Turbines 915.1 , 915.2 

Liquefied Petroleum Gas Code 502.9.10 

Explosion Prevention Systems 510.8.3 

National Fire Alarm Code 606.3 

Incinerators and Waste and Linen Handling Systems and Equipment 601.1 

Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Noncombustible Particulate Solids 502.9.5. 1, 502.17 

Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances 806. 1 

Standard Method of Test for Flame Travel and Smoke of Wires and Cables for Use in Air-Handling Spaces 602.2.1.1 

Identification of the Hazards of Materials for Emergency Response 502.8.4, Table 1 103. 1 , 5 10. 1 

Installatin of Stationary Fuel Power Plants .924. 1 



Sheet Metal Air Conditioning Contractors National Assoc, Inc. 
4021 Fafayette Center Road 
Chantilly, VA 22021 



Standard 

Reference 

Number 



Title 



Referenced 

in code 

section number 



SMACNA— 95 
SMACNA— 92 



HVAC Duct Construction Standards — Metal and Flexible. 
Fibrous Glass Duct Construction Standards 



.603.4 
.603.5 



108 



2007 OREGON MECHANICAL SPECIALTY CODE 



REFERENCED STANDARDS 



• 



UL 



Underwriters Laboratories, Inc. 
333 Pfingsten Road 
Northbrook, IL 60062-2096 



Standard 




Referenced 


Reference 




in code 


Number 


Title 


section number 



17—94 
103—98 

127—96 
181—96 

181 A— 94 

18 IB— 95 

197—93 

207—93 

300—96 

343—97 

391—95 

412—93 

471—95 

536—97 

555—99 

555C— 96 

555S— 99 

586—96 

641—95 

710—95 

726—98 

727—94 

729—98 

730—98 

731—95 

737—96 

762—99 

867—00 

896—93 

900—94 

959—01 

1240—94 

1261—96 

1482—98 

1777—98 

1820—97 

1887—96 

1995—98 
2043—96 

2158—97 
2162—94 



Vent or Chimney Connector Dampers for Oil-Fired Appliances — with Revisions through September 1998 803.6 

Factory-Built Chimneys, Residential Type and Building Heating Appliance — with 

Revisions through March 1999 805.2 

Factory-Built Fireplaces— with Revisions through November 1999 805.3, 903.1, 903.3 

Factory-made Air Ducts and Air Connectors — with Revisions through December 1998 512.2, 603.5, 603.6.1, 

603.6.2, 603.9.1.1, 603.9.1.2, 603.9.1.3, 604.13 

Standard for Closure Systems for use with Rigid Air Ducts and Air Connectors 603.9.1.1 

Standard for Closure Systems for use with Flexible Air Ducts and Air Connectors 603.9.1.2, 603.9.1.3 

Commercial Electric Cooking Appliances — With Revisions Through January 2000 507. 1 

Refrigerant-Containing Components and Accessories, Nonelectrical — with Revisions through October 1997 1101.2 

Fire Extinguishing Systems for Protection of Restaurant Cooking Areas, Fire Testing of 508.2 

Pumps for Oil-Burning Appliances- with revisions through December 22, 1999 1302.7 

Solid-Fuel and Combination-Fuel Central and Supplementary Furnaces — with Revisions through May 1999 918.1 

Refrigeration Unit Coolers — with Revisions through November 1998 1 101.2 

Cornmercial Refrigerators and Freezers — with Revisions through April 1998 1 101.2 

Flexible metallic Hose - with revisions through October 2000 1302.8 

Fire Dampers - with Revisions through October, 2000 607.3 

Ceiling Dampers 607.3, 607.6.2 

Smoke Dampers— with Revisions through December 1999 607.3, 607.3.1.1 

High-Efficiency, Particulate, Air Filter Units - with revisions through april 21, 2000 605.2 

Type L Low-Temperature Venting Systems — with Revisions through April 1999 802.1 

Exhaust Hoods for Commercial Cooking Equipment-with Revisions through April 1999 507.1 

Oil-Fired Boiler Assemblies — with Revisions through January 1999 916.1 

Oil-Fired Centeral Furnaces — with Revisions through January 1999 918.1 

Oil-Fired Floor Furnaces — with Revisions through January 1999 910.1 

Oil-Fired Wall Furnaces — with Revisions through January 1999 909.1 

Oil-Fired Unit Heaters — with Revisions through January 1999 920.1 

Fireplace Stoves — with Revisions through January 2000 805.2, 905.1 

Outline of Investigation for Power Ventilators for Restaurant Exhaust Appliances 506.5.1 

Electrostatic Air Cleaners 605.2 

Oil-Burning Stoves — with Revisions through November 1999 917.1, 922.1 

Air Filter Units - with revisions through October 1999 605.2 

Medium Heat Appliance Factory-Built Chimneys 805.5 

Electric Commercial Clothes Drying Equipment — with Revisions through October 1999 913.1 

Electric \yater Heaters for Pools and Tubs - with revisions through November 25, 1998 916.1 

Solid-Fuel Type Room Heaters— with Revisions through January 2000 905.1 

Chimney Liners — with Revisions through July 1998 801.18.4 

Fire Test of Pneumatic Tubing for Flame and Smoke Characteristics - with Revisions 

through March 1999 602.2.1.3 

Fire Tests of Plastic Sprinkler Pipe for Visible Flame and Smoke Characteristics — 

with Revisions through June 1999 602.2.1.2 

Heating and Cooling Equipment - with Revisions through August 1999 911.1, 918.1, 918.3, 1101.2 

Fire Test for Heat and Visible Smoke Release for Discrete Products and their 

Accessories Installed in Air-Handling Spaces-With Revisions through February 1998 602.2.1.4 

Outline of Investigation Electric Clothes Dryer — with Revisions through February 1999 913.1 

Outline of Investigation for Commercial Wood-Fired Baking Ovens — Refractory Type 917.1 



2007 OREGON MECHANICAL SPECIALTY CODE 



109 



110 2007 OREGON WiECHANlCAL SPECIALTY CODE 



APPENDIX A 

COMBUSTION AIR OPENINGS AND 
CHIMNEY CONNECTOR PASS-THROUGHS 

Not adopted by the State of Oregon 



Figures A-1 through A-4 are illustrations of appliances located in confined spaces. 



/■CHIMNEY OR VENT 




For SI: 1 square inch = 645 mm , 1 British thermal unit per hour = 0.2931 W. 

FIGURE A-1 
ALL AIR FROM INSIDE THE BUILDING 

NOTE: Each opening shall have a free area of not less than 1 square inch per 1 ,000 Btu per hour of the total input rating of all appli- 
ances in the enclosure and not less than 100 square inches. 



rCHIMNEYORVENT 



ALTERNATE 
AIR INLET— • 



-ATTIC VENTILATION 
(EACH END OF ATTIC) 




FURNACE WATER 
HEATER 



a 



INLET 
AIR 



A 



-CRAWL SPACE 
VENTILATION 



For SI: 1 square inch = 645 mm^, 1 British thermal unit per hour = 0.293 1 W. 

FIGURE A-2 
ALL AIR FROM OUTDOORS— INLET AIR FROM VENTILATED CRAWL SPACE AND OUTLET AIR TO VENTILATED ATTIC 

NOTE: The inlet and and outlet air openings shall each have a free area of not less than 1 square inch per 4,000 Btu per hour of the 
total input rating of all appliances in the enclosure. 



2007 OREGON MECHANICAL SPECIALTY CODE 



111 



APPENDIX A 



rCHIMNEYORVENT 



-ATTIC VENTILATION 
(EACH END OF ATTIC) 




INLET AIR DUCT 

(ENDS 1 FOOT ABOVE FLOOR) 



lU 



For SI: 1 foot = 304.8 mm, 1 square inch = 645 mrr^, 1 British thermal unit per hour = 0.2931 W. 

FIGURE A-3 
ALL AIR FROM OUTDOORS THROUGH VENTILATED ATTIC 

NOTE: The inlet and outlet air openings shall each have a free area of not less than 1 square inch per 4,000 Btu per hour of the total 
input rating of all appliances in the enclosure. 



rCHIMNEYORVENT 




For SI: 1 foot = 304.8 mm, 1 square inch = 645 mm^, 1 British thermal unit per hour = 0.2931 W. 

FIGURE A-4 
ALL AIR FROWl OUTDOORS THROUGH HORIZONTAL DUCTS OR DIRECT OPENINGS 



NOTE: Each air duct opening shall have a free area of not less than 1 square inch per 2,000 Btu per hour of the total input rating of all 
appliances in the enclosure. If the appliance room is located against an outside wall and the air openings communicate directly with 
the outdoors, each opening shall have a free area of not less than 1 square inch per 4,000 Btu per hour or the total input rating of all 
appliances in the enclosure. 



112 



2007 OREGON MECHANJCAL SPECIALTY CODE 



APPENDIX A 



SYSTEM A 



FIRE-CLAY LINER 





2" MIN. CHIMNEY CLEARANCE 
TO BRICK AND COMBUSTIBLE 
MATERIALS. 

MIN. CLEARANCE: 
12" OF BRICK 

CHIMNEY CONNECTOR 



FIRE-CLAY LINER 

LJ ^^^^3 1/2" THICK BRICK 
MASONRY CHIMNEY 



12" MIN. TO COMBUSTIBLES-" 



["-INSOLUiLE 
FRACTORY CEMENT 



CHIMNEY SECTION 
FLUSH WITH INSIDE 
OF FLUE 




2" mm. QHMHEr clearanc 
FROM MASONRY TO SHEET 
SUPPORTS AND COMBUSTIi 

MATERIALS. 



CHIMNEY CONNECTOR 

CHIMNEY SECTION MANUFACTURER'S 
PARTS SHALL BE UTIUZED TO ATTACH 
CONNECTOR TO CHIMNEY SECTION. 

LABELED. SOUD-INSUUTED. FACTORY^ 

BUILT CHIMNEY SECTION 

SHEU STEEL SUPPORTS 




FACTORY ->BUILT 
CHIMNEY SECTION 



AIR SPACE 



For SI: 1 inch = 25.4 mm. 



FIGURE A-5 
CHIMNEY CONNECTOR SYSTEMS 



2007 OREGON MECHANICAL SPECIALTY CODE 



113 



APPENDIX A 




OH ©Fl". 






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e©£y3iUSTiiLE Ci;3ATEilALS 
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MASONRY 



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For SI: 1 inch = 25.4 mm. 



FIGURE A-5— continued 

CHDlViNEY CONNECTOR SYSTEMS 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIXB 

RECOMMENDED PERMIT FEE SCHEDULE 

(Not adopted by the State of Oregon) 

B101 
MECHANICAL WORK, OTHER THAN GAS PIPING SYSTEMS 

BlOl.l Initial Fee 

For issuing each permit $_ 

B101.2 Additional Fees 

BlOl.2.1 Fee for inspecting heating, ventilating, ductwork, air-conditioning, exhaust, venting, combustion air, pressure vessel, 

solar, fuel oil and refrigeration systems and appliance installations shall be $ for the first $1,000.00, or fraction thereof, of 

valuation of the installation pliis $ for each additional $1 ,000.00 or fraction thereof. 

BlOl.2.2 Fee for inspecting repairs, alterations and additions to an existing system shall be $ plus $ for each $ 1 ,000.00 or 

fraction thereof . 

BlOl.2.3 Fee for inspecting boilers (based upon Btu input): 

33,000 Btu (1 BHp) to 165,000 (5 BHp) $ 

165,001 Btu (5 BHp) to 330,000 (10 BHp) $ 

330,001 Btu (10 BHp) to 1,165,000 (52 BHp) $ 

1,165,001 Btu (52 BHp) to 3,300,000 (98 BHp) $ 

over 3,300,000 Btu (98 BHp) $ 

For SI: 1 British thermal unit = 0.293 1 W, 1 BHp = 33,475 Btu/hr. 

B102 
FEE FOR REINSPECTION 

If it becomes necessary to make a reinspection of a heating, ventilation, air-conditioning or refrigeration system, or boiler installa- 
tion, the installer of such equipment shall pay a reinspection fee of $ . 

B103 
TEMPORARY OPERATION INSPECTION FEE 

When preliminary inspection is requested for purposes of permitting temporary operation of a heating, ventilating, refrigeration, or 

air-conditioning system, or portion thereof, a fee of $_ shall be paid by the contractor requesting such preliminary inspection. If 

the system is not approved for temporary operation on the first preliminary inspection, the usual reinspection fee shall be charged 
for each subsequent preliminary irispection for such purpose. 

8104 
SELF-CONTAINED UNITS LESS THAN 2 TONS 

In all buildings, except one- and two-family dwellings, where self-contained air-conditioning units of less than 2 tons are to be 
installed, the fee charged shall be that for the total costof all units combined (see B 101. 2.1 for rate). 



2007 OREGON MECHANICAL SPECIALTY CODE 1 1 5 



116 2007 OREGON WiECHANICAL SPECIALTY CODE 



APPENDIX C 

FUEL GAS 



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SECTION C1 01 
GENERAL 

ClOl.l Scope. This appendix shall apply to the installation of 
I fuel gas piping systems, fuel gas utilization equipment, gas- 
' eous hydrogen systems and related accessories in accordance 
I I with Sections ClOl.1.1 through ClOl.1.4. 

Exception: Detached one- and two-family dwellings and 
multiple single-family dwellings (townhouses) not more 
than three stories high with separate means of egress and 
their accessory structures shall comply with the Oregon 
Residential Specialty Code. 

■^ ClOl.1.1 Gaseous hydrogen systems. Gaseous hydrogen 
systems shall be regulated by Section C701. 

ClOl.1.2 Piping systems. These regulations cover piping 
systems for natural gas with an operating pressure of 1 25 
pounds per square inch gauge (psig) (862 kPa gauge) or 
less, and for LP-gas with an operating pressure of 20 psig 
(140 kPa gauge) or less, except as provided in Section 
C402.6.1. Coverage shall extend from the point of delivery 
to the outlet of the equipment shutoff valves. Piping systems 
requirements shall include design, materials, components, 
fabrication, assembly, installation, testing and inspection. 

ClOl.1.3 Gas utilization equipment. Requirements for 
gas utilization equipment and related accessories shall 
include installation, combustion and ventilation air and 
venting and connections to piping systems. 

ClOl.1.4 Systems and equipment outside the scope. This 
code shall not apply to the following: 



II 
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'> 



1 . Portable fuel-gas utilization equipment of all types 
that is not connected to a fixed fuel piping system. 

2. Raw material (feedstock) applications except for 
piping to special atmosphere generators. 

3. Oxygen-fuel gas cutting and welding systems. 

4. Industrial gas applications using gases such as acet- 
ylene and acetylenic compounds, hydrogen, ammo- 
nia, carbon monoxide, oxygen and nitrogen. 

5 . Petroleum refineries, pipeline compressor or pump- 
ing stations, loading terminals, compounding 
plants, refinery tank farms and natural gas process- 
ing plants. 

6. Integrated chemical plants or portions of such plants 
where flammable or combustible liquids or gases 
are produced by, or used in, chemical reactions. 

7. LP-gas installations at utility gas plants. 

8. Liquefied natural gas (LNG) installations. 

9. Proprietary items of equipment, apparatus or instru- 
ments such as gas-generating sets, compressors and 
calorimeters. 



10. LP-gas equipment for vaporization, gas mixing and 
gas manufacturing. 

11. Temporary fuel-gas piping or hoses for buildings 
under construction or renovation that is not to 
become part of the permanent piping system. 

12. Installation of LP-gas systems for railroad switch 
heating. 

13. Installation of hydrogen gas, LP-gas and com- 
pressed natural gas (CNG) systems on vehicles. 

14. Except as provided in Section C40 1.1.1, gas piping, 
meters, gas pressure regulators and other appurte- 
nances used by the serving gas supplier in the distri- 
bution of gas, other than undiluted LP-gas. 

15. Building design and construction, except as speci- 
fied herein. 

16. Piping systems for mixtures of gas and air within the 
flammable range with an operating pressure greater 
than 10 psig (69 kPa gauge). 

17. Portable fuel cell appliances that are neither con- 
nected to a fixed piping system nor interconnected 
to a power grid. 

C101.2 Intent. The purpose of this code or appendix is to pro- 
vide minimum standards to safeguard life or limb, health, prop- 
erty and public welfare by regulating and controlling the 
design, construction, installation, quality of materials and loca- 
tion of fuel gas systems. 

C101.3 Severabihty. If a section, subsection, sentence, clause 
or phrase of this code or appendix is, for any reason, held to be 
unconstitutional, such decision shall not affect the validity of 
the remaining portions of this code. 



SECTION C102 
INSPECTIONS AND TESTING 

C102.1 Required inspections and testing. The code official, 
upon notification from the permit holder or the permit holder's 
agent, shall make the following inspections and other such 
inspections as necessary, and shall either release that portion of 
the construction or notify the permit holder or the permit 
holder's agent of violations that are required to be corrected. 
The holder of the permit shall be responsible for scheduling 
such inspections. 

1 . Underground inspection shall be made after trenches or 
ditches are excavated and bedded, piping is installed and 
before backfill is put in place. When excavated soil con- 
tains rocks, broken concrete, frozen chunks and other 
rubble that would damage or break the piping or cause 
corrosive action, clean backfill shall be on the job site. 

2. Rough-in inspection shall be made after the roof, fram- 
ing, fireblocking and bracing are in place and compo- 



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II 
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2007 OREGON MECHANICAL SPECIALTY CODE 



117.1 



APPENDIX C 



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> 

II 



nents to be concealed are complete, and prior to the 
installation of wall or ceiling membranes. 

3. Final inspection shall be made upon completion of the 
installation. 

The requirements of this section shall not be considered to 
prohibit the operation of any heating equipment installed to 
replace existing heating equipment serving an occupied por- 
tion of a structure in the event a request for inspection of such 
heating equipment has been filed with the department not more 
than 48 hours after replacement work is completed, and before 
any portion of such equipment is concealed by any permanent 
portion of the structure. 

C102.2 Testing. Installations shall be tested as required in this 
code and in accordance with Sections C102.1 through C102.3. 
Tests shall be made by the permit holder and observed by the 
code official. 



> 



LI New, altered, extended or repaired installa- 
tions. New installations and parts of existing installations, 
which have been altered, extended, renovated or repaired, 
shall be tested as prescribed herein to disclose leaks and 
defects. 

C 1(02.2.2 Apparatus, instruments, material and labor 
for tests. Apparatus, instruments, material and labor 
required for testing an installation or part thereof shall be 
furnished by the permit holder. 

C102.2.3 Reinspection and testing. Where any work or 
installation does not pass an initial test or inspection, the 
necessary corrections shall be made so as to achieve compli- 
ance with this code. The work or installation shall then be 
resubmitted to the code official for inspection and testing. 

C102.3 Approval. After the prescribed tests and inspections 
indicate that the work complies in all respects with this appen- 
dix, a notice of approval shall be issued by the code official. 

C102.4 Temporary connection. The code official shall have 
the authority to allow the temporary connection of an installa- 
tion to the sources of energy for the purpose of testing the 
installation or for use under a temporary certificate of occu- 
pancy. 



SECTION C201 
GENERAL 

C201.1 Scope. Unless otherwise expressly stated, the follow- 
ing words and terms shall, for the purposes of this code and 
standard, have the meanings indicated in this chapter. 

C201.2 Interchangeability. Words used in the present tense 
include the future; words in the masculine gender include the 
feminine and neuter; the singular number includes the plural 
and the plural, the singular. 

C201.3 Terms defined in other codes. Where terms are not 
defined in this code and are defined in the Electrical Code, 
Building Code, Fire Code, Mechanical Code or Plumbing 
Code, such terms shall have meanings ascribed to them as in 
those codes. 

C201,4 Terms not defined. Except as defined in this chapter or 
elsewhere in this code, the interpretation of words used in this 



code shall be in accordance with the meanings defined in the 
Webster's Third New International Dictionary of the English 
Language, Unabridged, copyright 1986. 



SECTION C202 
GENERAL DEFINITIONS 

ACCESS (TO). That which enables a device, appliance or 
equipment to be reached by ready access or by a means that first 
requires the removal or movement of a panel, door or similar 
obstrucdon (see also "Ready access")- 

AIR CONDITIONER, GAS-FIRED. A gas-burning, auto- 
matically operated appliance for supplying cooled and/or 
dehumidified air or chilled liquid. 

AIR CONDITIONING. The treatment of air so as to control 
simultaneously the temperature, humidity, cleanness and dis- 
tribution of the air to meet the requirements of a conditioned 
space. 

AIR-HANDLING UNIT. A blower or fan used for the pur- 
pose of distributing supply air to a room, space or area. 

AIR, MAKEUP. Air that is provided to replace air being 
exhausted. 

ANODELESS RISER. A transition assembly in which plastic 
piping is installed and terminated above ground outside of a 
building.. 

APPLIANCE (EQUIPMENT). Any apparatus or equipment 
that utilizes gas as a fuel or raw material to produce light, heat, 
power, refrigeration or air conditioning. 

APPLIANCE, FAN- ASSISTED COMBUSTION. An apph- 
ance equipped with an integral mechanical means to eithei" 
draw or force products of combustion through the combustion 
chamber or heat exchanger. 



APPLIANCE, AUTOMATICALLY 
Appliances equipped with an automatic burner ignition and 
safety shutoff device and other automatic devices which 
accomplish complete turn-on and shutoff of the gas to the main 
burner or burners, and graduate the gas supply to the burner or 
burners, but do not affect complete shutoff of the gas. 

APPLIANCE TYPE. 

Low-heat appliance (residential appliance). Any appli- 
ance in which the products of combustion at the point of 
entrance to the flue under normal operating conditions have 
a temperature of 1,000°F (538°C) or less. 

Medium-heat appliance. Any appliance in which the prod- 
ucts of combustion at the point of entrance to the flue under 
normal operating conditions have a temperature of more 
than 1,000°F (538°C), but not greater than 2,000°F 
(1093°C). 

APPLIANCE, UNVENTED. An appliance designed or 
installed in such a manner that the products of combustion are 
not conveyed by a vent or chimney directly to the outside atmo- 
sphere. 

APPLIANCE, VENTED. An appliance designed and 
installed in such a manner that all of the products of combus- 



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117.2 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



> 



tion are conveyed directly from the appliance to the outside 
atmosphere through an approved chimney or vent system. 

ATMOSPHERIC PRESSURE. The pressure of the weight of 
air and water vapor on the surface of the earth, approximately 
14.7 pounds per square inch (psi) (101 kPa absolute) at sea 
level. 

AUTOMATIC IGNITION. Ignition of gas at the bumer(s) 
when the gas controlling device is turned on, including 
reignition if the flames on the burner(s) have been extinguished 
by means other than by the closing of the gas controlling 
device. 

BAFFLE. An object placed in an appliance to change the 
direction of or retard the flow of air, air-gas mixtures or flue 

gases. 

BAROMETRIC DRAFT REGULATOR. A balanced 
damper device attached to a chimney, vent connector, breech- 
ing or flue gas manifold to protect combustion equipment by 
controlling chimney draft. A double-acting barometric draft 
regulator is one whose balancing damper is free to move in 
either direction to protect combustion equipment from both 
excessive draft and backdraft. 

BRAZING. A metal-joining process wherein coalescence is 
produced by the use of a nonferrous filler metal having a melt- 
ing point above 1,000°F (538°C), but lower than that of the 
base metal being joined. The filler material is distributed 
between the closely fitted surfaces of the joint by capillary 
action. 

BROILER. A general term including salamanders, barbecues 
and other appliances cooking primarily by radiated heat, 
excepting toasters. 

BTU. Abbreviation for British thermal unit, which is the quan- 
tity of heat required to raise the temperature of 1 pound (454 g) 
of water 1°F (0.56°C) (1 Btu = 1055 J). 



I. A device for the final conveyance of the gas, or a 
mixture of gas and air, to the combustion zone. 

Imduced-draft. A burner that depends on draft induced by a 
fan that is an integral part of the appliance and is located 
downstream from the burner. 

Power. A burner in which gas, air or both are supplied at 
pressures exceeding, for gas, the line pressure, and for air, 
atmospheric pressure, with this added pressure being 
applied at the burner. 

CHIMNEY. A primarily vertical structure containing one or 
more flues, for the purpose of carrying gaseous products of 
combustion and air from an appliance to the outside atmo- 
sphere. 

Factory-built chimney. A listed and labeled chimney com- 
posed of factory-made components, assembled in the field 
in accordance with manufacturer's instructions and the con- 
ditions of the listing. 

Masonry chimney. A field-constructed chimney composed 
of solid masonry units, bricks, stones or concrete. 

Metal chimney. A field-constructed chimney of metal. 



CLEARANCE. The minimum distance through air measured 
between the heat-producing surface of the mechanical appli- 
ance, device or equipment and the surface of the combustible 
material or assembly. 

COMBUSTION. In the context of this code, refers to the rapid 
oxidation of fuel accompanied by the production of heat or heat 
and light. 

COMBUSTION AIR. Air necessary for complete combus- 
tion of a fuel, including theoretical air and excess air. 

COMBUSTION CHAMBER. The portion of an appliance 
within which combustion occurs. 

COMBUSTION PRODUCTS. Constituents resulting from 
the combustion of a fuel with the oxygen of the air, including 
inert gases, but excluding excess air. 

CONCEALED LOCATION. A location that cannot be 
accessed without damaging permanent parts of the building 
structure or finish surface. Spaces above, below or behind 
readily removable panels or doors shall not be considered as 
concealed. 

CONCEALED PIPING. Piping that is located in a concealed 
location (see "Concealed location"). 

CONDENSATE. The liquid that condenses from a gas 
(including flue gas) caused by a reduction in temperature or 
increase in pressure. 

CONNECTOR, APPLIANCE (Fuel). Rigid metalhc pipe 
and fittings, semirigid metallic tubing and fittings or a listed 
and labeled device that connects an appliance to the gas piping 
system. 

CONNECTOR, CHIMNEY OR VENT. The pipe that con- 
nects an appliance to a chimney or vent. 

CONTROL. A manual or automatic device designed to regu- 
late the gas, air, water or electrical supply to, or operation of, a 
mechanical system. 

CONVERSION BURNER. A unit consisting of a burner and 
its controls for installation in an appliance originally utilizing 
another fuel. 

COUNTER APPLIANCES. Appliances such as coffee brew- 
ers and coffee urns and any appurtenant water-heating equip- 
ment, food and dish warmers, hot plates, griddles, waffle 
bakers and other appliances designed for installation on or in a 
counter. 

CUBIC FOOT. The amount of gas that occupies 1 cubic foot 
(0.02832 m^) when at a temperature of 60°F (16°C), saturated 
with water vapor and under a pressure equivalent to that of 30 
inches of mercury (101 kPa). 

DAMPER. A manually or automatically controlled device to 
regulate draft or the rate of flow of air or combustion gases. 

DECORATIVE APPLIANCE, VENTED. A vented appli- 
ance wherein the primary function lies in the aesthetic effect of 
the flames. 

DECORATIVE APPLIANCES FOR INSTALLATION IN 
VENTED FIREPLACES. A vented appliance designed for 
installation within the fire chamber of a vented fireplace, 



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2007 OREGON MECHANICAL SPECIALTY CODE 



117.3 



APPENDIX C 



wherein the primary function lies in the aesthetic effect of the 
flames. 

DEMAND. The maximum amount of gas input required per 
unit of time, usually expressed in cubic feet per hour, or Btu/h 
(1 Btu/h = 0.2931 W). 

DESIGN FLOOD ELEVATION. The elevation of the 
"design flood," including wave height, relative to the datum 
specified on the community's legally designated flood hazard 
map. 

DILUTION AIR. Air that is introduced into a draft hood and 
is mixed with the flue gases. 

DIRECT- VENT APPLIANCES, Appliances that are con- 
structed and installed so that all air for combustion is derived 
directly from the outside atmosphere and all flue gases are dis- 
charged directly to the outside atmosphere. 

DRAFT. The pressure difference existing between the equip- 
ment or any component part and the atmosphere, that causes a 
continuous flow of air and products of combustion through the 
gas passages of the appliance to the atmosphere. 

Mechanical or Induced draft. The pressure difference cre- 
ated by the action of a fan, blower or ejector, that is located 
between the appliance and the chimney or vent termination. 

Natural draft. The pressure difference created by a vent or 
chimney because of its height, and the temperature differ- 
ence between the flue gases and the atmosphere. 

DRAFT HOOD. A nonadjustable device built into an appli- 
ance, or made as part of the vent connector from an appliance, 
that is designed to (1) provide for ready escape of the flue gases 
from the appliance in the event of no draft, backdraft or stop- 
page beyond the draft hood, (2) prevent a backdraft from enter- 
ing the appliance, and (3) neutralize the effect of stack action of 
the chimney or gas vent upon operation of the appliance. 

DRAFT REGULATOR, A device that functions to maintain a 
desired draft in the appliance by automatically reducing the 
draft to the desired value. 

DRIP. The container placed at a low point in a system of piping 
to collect condensate and from which the condensate is remov- 
able. 

DRY GAS, A gas having a moisture and hydrocarbon dew 
point below any normal temperature to which the gas piping is 
exposed. 

DUCT FURNACE. A warm-air furnace normally installed in 
an air distribution duct to supply warm air for heating. This def- 
inition shall apply only to a warm-air heating appliance that 
depends for air circulation on a blower not furnished as part of 
the furnace. 

DUCT SYSTEM, A continuous passageway for the transmis- 
sion of air that, in addition to ducts, includes duct fittings, 
dampers, plenums, fans and accessory air-handling equipment. 

EQUIPMENT. See "Apphance." 

FIRING VALVE. A valve of the plug and barrel type designed 
for use with gas, and equipped with a lever handle for manual 
operation and a dial to indicate the percentage of opening. 



FLAME SAFEGUARD. A device that will automatically shut 
off the fuel supply to a main burner or group of burners when 
the means of ignition of such burners becomes inoperative, and 
when flame failure occurs on the burner or group of burners. 

FLOOD HAZARD AREA. The greater of the following two 
areas: 

1. The area within a floodplain subject to a 1 percent or 
greater chance of flooding in any given year. 

2. This area designated as a flood hazard area on a commu- 
nity's flood hazard map, or otherwise legally designated. 

FLOOR FURNACE. A completely self-contained furnace 
suspended from the floor of the space being heated, taking air 
for combustion from outside such space and with means for 
observing flames and lighting the appliance from such space. 

Gravity type. A floor furnace depending primarily upon 
circulation of air by gravity. This classification shall also 
include floor furnaces equipped with booster-type fans 
which do not materially restrict free circulation of air by 
gravity flow when such fans are not in operation. 

Fan type. A floor furnace equipped with a fan which pro- 
vides the primary means for circulating air. 

FLUE, APPLIANCE. The passage(s) within an appliance 
through which combustion products pass from the combustion 
chamber of the appliance to the draft hood inlet opening on an 
appliance equipped with a draft hood or to the outlet of the 
appliance on an appliance not equipped with a draft hood. 

FLUE COLLAR. That portion of an appliance designed for 
the attachment of a draft hood, vent connector or venting sys- 
tem. 

FLUE GASES. Products of combustion plus excess air in 
appliance flues or heat exchangers. 

FLUE LINER (LINING). A system or material used to form 
the inside surface of a flue in a chimney or vent, for the purpose 
of protecting the surrounding structure from the effects of com- 
bustion products and for conveying combustion products with- 
out leakage to the atmosphere. 

FUEL GAS. A natural gas, manufactured gas, liquefied petro- 
leum gas or mixtures of these gases. 

FUEL GAS UTILIZATION EQUIPMENT, See "Appli- 
ance." 

FURNACE. A completely self-contained heating unit that is 
designed to supply heated air to spaces remote from or adjacent 
to the appliance location. 

FURNACE, CENTRAL. A self-contained appliance for heat- 
ing air by transfer of heat of combustion through metal to the 
air, and designed to supply heated air through ducts to spaces 
remote from or adjacent to the appliance location. 

Downflow furnace, A furnace designed with airflow dis- 
charge vertically downward at or near the bottom of the fur- 
nace. 

Forced air furnace with cooling unit, A single-package 
unit, consisting of a gas-fired forced-air furnace of one of 
the types listed below combined with an electrically or fuel 



117.4 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



gas-powered summer air-conditioning system, contained in 
a common casing. 

Forced-air type. A central furnace equipped with a fan or 
blower which provides the primary means for circulation of 
air. 

Gravity furnace with booster fan. A furnace equipped 
with a booster fan that does not materially restrict free circu- 
lation of air by gravity flow when the fan is not in operation. 

Gravity type. A central furnace depending primarily on cir- 
culation of air by gravity. 

Horizontal forced-air type. A furnace with airflow 
through the appliance essentially in a horizontal path. 

Multiple-position furnace. A furnace designed so that it 
can be installed with the airflow discharge in the upflow, 
horizontal or downflow direction. 

Upflow furnace. A furnace designed with airflow dis- 
charge vertically upward at or near the top of the furnace. 
This classification includes "highboy" furnaces with the 
blower mounted below the heating element and "lowboy" 
furnaces with the blower mounted beside the heating ele- 
ment. 

FURNACE, ENCLOSED. A specific heating, or heating and 
ventilating, furnace incorporating an integral total enclosure 
and using only outside air for combustion. 

FURNACE PLENUM. An air compartment or chamber to 
which one or more ducts are connected and which forms part of 
an air distribution system. 

GAS CONVENIENCE OUTLET. A permanently mounted, 
manually operated device that provides the means for connect- 
ing an appliance to, and disconnecting an appliance from, the 
supply piping. The device includes an integral, manually oper- 
ated valve with a nondisplaceable valve member and is 
designed so that disconnection of an appliance only occurs 
when the manually operated valve is in the closed position. 

GASEOUS HYDROGEN SYSTEM. See Section C702.1. 

GAS PIPING. An installation of pipe, valves or fittings 
installed on a premises or in a building and utilized to convey 
fuel gas. 

GAS UTILIZATION EQUIPMENT. An appliance that uti- 
lizes gas as a fuel or raw material or both. 

HAZARDOUS LOCATION. Any location considered to be a 
fire hazard for flammable vapors, dust, combustible fibers or 
other highly combustible substances. The location is not neces- 
sarily categorized in the building code as a high-hazard group 
classification. 

HOUSE PIPING. See "Piping system." 

HYDROGEN CUT-OFF ROOM. See Section C702.1. 

HYDROGEN GENERATING APPLIANCE. See Section 
C702.1. 

IGNITION PILOT. A pilot that operates during the lighting 
cycle and discontinues during main burner operation. 

IGNITION SOURCE. A flame, spark or hot surface capable 
of igniting flammable vapors or fumes. Such sources include 



appliance burners, burner ignitors, and electrical switching 
devices. 

INCINERATOR. An appliance used to reduce combustible 
refuse material to ashes and which is manufactured, sold and 
installed as a complete unit. 

INDUSTRIAL AIR HEATERS, DIRECT-FIRED 
NONRECIRCULATING. A heater in which all the products 
of combustion generated by the burners are released into the air 
stream being heated. The purpose of the heater is to offset 
building heat loss by heating only outdoor air. 

INDUSTRIAL AIR HEATERS, DIRECT-FIRED RECIR- 
CULATING. A heater in which all the products of combustion 
generated by the burners are released into the air stream being 
heated. The purpose of the heater is to offset building heat loss 
by heating outdoor air, and, if applicable, indoor air. 

INFRARED RADIANT HEATER. A heater that directs a 
substantial amount of its energy output in the form of infrared 
radiant energy into the area to be heated. Such heaters are of 
either the vented or unvented type. 

JOINT, FLANGED. A joint made by bolting together a pair of 
flanged ends. 

JOINT, FLARED. A metal-to-metal compression joint in 
which a conical spread is made on the end of a tube that is com- 
pressed by a flare nut against a mating flare. 

JOINT, MECHANICAL. A general form of gas-tight joints 
obtained by the joining of metal parts through a positive-hold- 
ing mechanical construction, such as flanged joint, threaded 
joint, flared joint or compression joint. 

JOINT, PLASTIC ADHESIVE. A joint made in thermoset 
plastic piping by the use of an adhesive substance which forms 
a continuous bond between the mating surfaces without dis- 
solving either one of them. 

JOINT, PLASTIC HEAT FUSION. A joint made in thermo- 
plastic piping by heating the parts sufficiently to permit fusion 
of the materials when the parts are pressed together. 

JOINT, WELDED. A gas-tight joint obtained by the joining 
of metal parts in molten state. 

LABELED. Devices, equipment, appliances or materials to 
which have been affixed a label, seal, symbol or other identify- 
ing mark of a nationally recognized testing laboratory, inspec- 
tion agency or other organization concerned with product 
evaluation that maintains periodic inspection of the production 
of the above-labeled items and by whose label the manufac- 
turer attests to compliance with applicable nationally recog- 
nized standards. 

LIMIT CONTROL. A device responsive to changes in pres- 
sure, temperature or level for turning on, shutting off or throt- 
tling the gas supply to an appliance. 

LIQUEFIED PETROLEUM GAS or LPG (LP-GAS). Liq- 
uefied petroleum gas composed predominately of propane, 
propylene, butanes or butylenes, or mixtures thereof that is gas- 
eous under normal atmospheric conditions, but is capable of 
being liquefied under moderate pressure at normal tempera- 
tures. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.5 



APPENDIX C 



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LISTED. Equipment, appliances or materials included in a list 
published by a nationally recognized testing laboratory, inspec- 
tion agency or other organization concerned with product evalu- 
ation that maintains periodic inspection of production of listed 
equipment, appliances or materials, and whose hsting states 
either that the equipment, appliance or material meets nationally 
recognized standards or has been tested and found suitable for 
use in a specified manner. The means for identifying Usted 
equipment, appUances or materials may vary for each testing 
laboratory, inspection agency or other organization concerned 
with product evaluation, some of which do not recognize equip- 
ment, appliances or materials as listed unless they are also 
labeled. The authority having jurisdiction shall utilize the system 
employed by the listing organization to identify a listed product. 

LOG LIGHTER, A manually operated solid fuel ignition 
appliance for installation in a vented solid fuel -burning fire- 
place. 

LUBRICATED PLUG-TYPE VALVE, A valve of the plug 
and barrel type provided with means for maintaining a lubri- 
cant between the bearing surfaces. 



BURNER. A device or group of devices essentially 
forming an integral unit for the final conveyance of gas or a 
mixture of gas and air to the combustion zone, and on which 
combustion takes place to accomplish the function for which 
the appliance is designed. 

METER. The instrument installed to measure the volume of 
gas delivered through it. 

MODULATING. Modulating or throttling is the action of a 
control from its maximum to minimum position in either pre- 
determined steps or increments of movement as caused by its 
actuating medium. 

OFFSET (VENT). A combination of approved bends that 
makes two changes in direction bringing one section of the vent 
out of line but into a line parallel with the other section. 

ORIFICE. The opening in a cap, spud or other device whereby 
the flow of gas is limited and through which the gas is dis- 
charged to the burner. 

OUTLET. A threaded connection or bolted flange in a pipe 
system to which a gas-burning appliance is attached. 

OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM 
(ODS). A system designed to act to shut off the gas supply to 
the main and pilot burners if the oxygen in the surrounding 
atmosphere is reduced below a predetermined level. 



r. A small flame that is utilized to ignite the gas at the 
main burner or burners. 



T. Where used in this code, "piping" refers to either 
pipe or tubing, or both. 

Pipe. A rigid conduit of iron, steel, copper, brass or plastic. 

Ibbing. Semirigid conduit of copper, aluminum, plastic or 
steel. 

PIPING SYSTEM. All fuel piping, valves and fittings from 
the outlet of the point of delivery to the outlets of the equipment 
shutoff valves. 



1 . Spring type, limited adjustment. A regulator in which 
the regulating force acting upon the diaphragm is 
derived principally from a spring, the loading of 
which is adjustable over a range of not more than 15 
percent of the outlet pressure at the midpoint of the 
adjustment range. 

2. Spring type, standard adjustment. A regulator in which 
the regulating force acting upon the diaphragm is 
derived principally from a spring, the loading of which 
is adjustable. The adjustment means shall be concealed. 

Multistage. A regulator for use with a single gas whose 
adjustment means is capable of being positioned manually 
or automatically to two or more predetermined outlet pres- 
sure settings. Each of these settings shall be adjustable or 



PLASTIC, THERMOPLASTIC. A plastic that is capable of 
being re]3eatedly softened by increase of temperature and hard- 
ened by decrease of temperature. 

POINT OF DELIVERY. For natural gas systems, the point of 
delivery is the outlet of the service meter assembly or the outlet 
of the service regulator or service shutoff valve where a meter 
is not provided. Where a valve is provided at the outlet of the 
service meter assembly, such valve shall be considered to be 
downstream of the point of delivery. For undiluted liquefied 
petroleum gas systems, the point of delivery shall be consid- 
ered to be the outlet of the first- stage pressure regulator that 
provides utilization pressure, exclusive of line gas regulators, 
in these systems. 

PORTABLE FUEL CELL APPLIANCE. A fuel cell gener- 
ator of electricity, which is not fixed in place. A portable fuel 
cell appliance utilizes a cord and plug connection to a grid-iso- 
lated load and has an integral fuel supply. 

PRESSURE DROP. The loss in pressure due to friction or 
obstruction ijn pipes, valves, fittings, regulators and burners. 

PRESSURE TEST. An operation performed to verify the 
gas-tight integrity of gas piping following its installation or 
modification. 

PURGE. To free a gas conduit of air or gas, or a mixture of gas 
and air. 

QUICK-DISCONNECT DEVICE. A hand-operated device 
that provides a means for connecting and disconnecting an 
appliance or an appliance connector to a gas supply and that is 
equipped with an automatic means to shut off the gas supply 
when the device is disconnected. 

READY ACCESS (TO). That which enables a device, appli- 
ance or equipment to be directly reached, without requiring the 
removal or movement of any panel, door or similar obstruction 
(see "Access"). <; 

REGULATOR. A device for controlling and maintaining a 
uniform supply pressure, either pounds-to-inches water col- 
unm (MP regulator) or inches-to-inches water column (appli- 
ance regulator). 

REGULATOR, GAS APPLIANCE. A pressure regulator for 
controlling pressure to the manifold of equipment. Types of 
appliance regulators are as follows: 



117.6 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 




> 



> 



nonadjustable. The regulator may modulate outlet pressures 
automatically between its maximum and minimum prede- 
termined outlet pressure settings. 

Nonadjustable, 

1. Spring type, nonadjustable. A regulator in which the 
regulating force acting upon the diaphragm is derived 
principally from a spring, the loading of which is not 
field adjustable. 

2. Weight type. A regulator in which the regulating 
force acting upon the diaphragm is derived from a 
weight or combination of weights. 

REGULATOR, LINE GAS PRESSURE. A device placed in 
a gas line between the service pressure regulator and the equip- 
ment for controlling, maintaining or reducing the pressure in 
that portion of the piping system downstream of the device. 

REGULATOR, MEDIUM-PRESSURE (MP Regulator). 

A line pressure regulator that reduces gas pressure from the 
range of greater than 0.5 psig (3.4 kPa) and less than or equal to 
5 psig (34.5 kPa) to a lower pressure. 

REGULATOR, PRESSURE. A device placed in a gas line for 
reducing, controlling and maintaining the pressure in that por- 
tion of the piping system downstream of the device. 

REGULATOR, SERVICE PRESSURE. A device installed 
by the serving gas supplier to reduce and limit the service line 
pressure to delivery pressure. 

RELIEF OPENING. The opening provided in a draft hood to 
permit the ready escape to the atmosphere of the flue products 
from the draft hood in the event of no diraft, back draft, or stop- 
page beyond the draft hood, and to permit air into the draft hood 
in the event of a strong chimney updraft. 

RISER, GAS. A vertical pipe supplying fuel gas. 

ROOM HEATER, UNVENTED. See "Unvented room heater." 

ROOM HEATER, VENTED. A free-standing heating unit 
used for direct heating of the space in and adjacent to that in 
which the unit is located (see also "Vented room heater"). 

ROOM LARGE IN COMPARISON WITH SIZE OF 

EQUIPMENT. Rooms having a volume equal to at least 12 
times the total volume of a furnace or air-conditioning appli- 
ance and at least 1 6 times the total volume of a boiler. Total vol- 
ume of the appliance is determined from exterior dimensions 
and is to include fan compartments and burner vestibules, when 
used. When the actual ceiling height of a room is greater than 8 
feet (2438 mm), the volume of the room is figured on the basis 
of a ceihng height of 8 feet (2438 mm). 

SAFETY SHUTOFF DEVICE. See "Flame safeguard." 

SHAFT. An enclosed space extending through one or more 
stories of a building, connecting vertical openings in succes- 
sive floors, or floors and the roof. 

SPECIFIC GRAVITY. As applied to gas, specific gravity is 
the ratio of the weight of a given volume to that of the same vol- 
ume of air, both measured under the same condition. 

STATIONARY FUEL CELL POWER PLANT. A self con- 
tained package or factory-matched packages which constitute 
an automatically operated assembly of integrated systems for 



generating electrical energy and recoverable thermal energy 
that is permanently connected and fixed in place. 

THERMOSTAT. 

Electric switch type. A device that senses changes in tem- 
perature and controls electrically, by means of separate 
components, the flow of gas to the burner(s) to maintain 
selected temperatures. 

Integral gas valve type. An automatic device, actuated by 
temperature changes, designed to control the gas supply to 
the burner(s) in order to maintain temperatures between pre- 
determined limits, and in which the thermal actuating ele- 
ment is an integral part of the device. 

1. Graduating thermostat. A thermostat in which the 
motion of the valve is approximately in direct propor- 
tion to the effective motion of the thermal element 
induced by temperature change. 

2. Snap-acting thermostat. A thermostat in which the 
thermostatic valve travels instantly from the closed to 
the open position, and vice versa. 

TRANSITION FITTINGS, PLASTIC TO STEEL. An 

adapter for joining plastic pipe to steel pipe. The purpose of this 
fitting is to provide a permanent, pressure-tight connection 
between two materials which cannot be joined directly one to 
another. 

UNIT HEATER. 

High-static pressure type. A self-contained, automatically 
controlled, vented appliance having integral means for cir- 
culation of air against 0.2 inch (15 mm HjO) or greater static 
pressure. Such appliance is equipped with provisions for 
attaching an outlet air duct and, where the appliance is for 
indoor installation remote from the space to be heated, is 
also equipped with provisions for attaching an inlet air duct. 

Low-static pressure type. A self-contained, automatically 
controlled, vented appliance, intended for installation in the 
space to be heated without the use of ducts, having integral 
means for circulation of air. Such units are allowed to be 
equipped with louvers or face extensions made in accor- 
dance with the manufacturer's specifications. ^ 

UNVENTED ROOM HEATER. An unvented heating appli- 
ance designed for stationary installation and utilized to provide 
comfort heating. Such appliances provide radiant heat or con- 
vection heat by gravity or fan circulation directly from the 
heater and do not utilize ducts. 

VALVE. A device used in piping to control the gas supply to 
any section of a system of piping or to an appliance. 

Automatic. An automatic or semiautomatic device consist- 
ing essentially of a valve and operator that control the gas 
supply to the bumer(s) during operation of an appliance. 
The operator shall be actuated by apphcation of gas pressure 
on a flexible diaphragm, by electrical means, by mechanical 
means, or by other approved means. 

Automatic gas shutoff. A valve used in conjunction with an 
automatic gas shutoff device to shut off the gas supply to a 
water-heating system. It shall be constructed integrally with 
the gas shutoff device or shall be a separate assembly. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.7 



APPENDIX C 



Equipment shutoff. A valve located in the piping system, 
used to isolate individual equipment for purposes such as 
service or replacement. 

Imdividual main burner. A valve that controls the gas sup- 
ply to an individual main burner. 

Main burner control. A valve that controls the gas supply 
to the main burner manifold. 

Manual main gas-controL A manually operated valve in 
the gas line for the purpose of completely turning on or shut- 
ting off the gas supply to the appliance, except to pilot or 
pilots that are provided with independent shutoff. 



An automatic shutoff valve installed in the 
gas supply piping and set to shut off when unsafe conditions 
occur. The device remains closed until manually reopened. 

Service shutoff. A valve, installed by the serving gas sup- 
plier between the service meter or source of supply and the 
customer piping system, to shut off the entire piping system. 



A pipe or other conduit composed of factory-made 
components, containing a passageway for conveying combus- 
tion products and air to the atmosphere, listed and labeled for 
use with a specific type or class of appliance. 

Special gas vent. A vent listed and labeled for use with 
listed Category II, III and IV appliances. 

Type B vent. A vent listed and labeled for use with appli- 
ances with draft hoods and other Category I appliances that 
are listed for use with Type B vents. 

Type BW vent. A vent listed and labeled for use with wall 
furnaces. 

Type L vent. A vent listed and labeled for use with appli- 
ances that are listed for use with Type L or Type B vents. 

VENT CONNECTOR. See "Connector." 

VENT GASES. Products of combustion from appliances plus 
excess air plus dilution air in the vent connector, gas vent or 
chimney above the draft hood or draft regulator. 



Breather. Piping run from a pressure-regulating device to 
the outdoors, designed to provide a reference to atmo- 
spheric pressure. If the device incorporates an integral pres- 
sure relief mechanism, a breather vent can also serve as a 
relief vent. 

Relief. Piping run from a pressure-regulating or pres- 
sure-limiting device to the outdoors, designed to provide for 
the safe venting of gas in the event of excessive pressure in 
the gas piping system. 

VENTED APPLIANCE CATEGORIES. Appliances that 
are categorized for the purpose of vent selection are classified 
into the following four categories: 

Category I. An appliance that operates with a nonpositive 
vent static pressure and with a vent gas temperature that 
avoids excessive condensate production in the vent. 

Category II, An appliance that operates with a nonpositive 
vent static pressure and with a vent gas temperature that is 



capable of causing excessive condensate production in the 
vent. 

Category III. An appliance that operates with a positive 
vent static pressure and with a vent gas temperature that 
avoids excessive condensate production in the vent. 

Category IV. An appliance that operates with a positive vent 
static pressure and with a vent gas temperature that is capable 
of causing excessive condensate production in the vent. 

VENTED ROOM HEATER. A vented self-contained, 
free-standing, nonrecessed appliance for furnishing warm air 
to the space in which it is installed, directly from the heater 
without duct connections. 

VENTED WALL FURNACE. A self-contained vented appli- 
ance complete with grilles or equivalent, designed for incorpo- 
ration in or permanent attachment to the structure of a building, 
mobile home or travel trailer, and furnishing heated air circu- 
lated by gravity or by a fan directly into the space to be heated 
through openings in the casing. This definition shall exclude 
floor furnaces, unit heaters and central furnaces as herein 
defined. 

VENTING SYSTEM. A continuous open passageway from 
the flue collar or draft hood of an appliance to the outside atmo- 
sphere for the purpose of removing flue or vent gases. A vent- 
ing system is usually composed of a vent or a chimney and vent 
connector, if used, assembled to form the open passageway. 

Mechanical draft venting system, A venting system 
designed to remove flue or vent gases by mechanical means, 
that consists of an induced draft portion under nonpositive 
static pressure or a forced draft portion under positive static 
pressure. 

Forced-draft venting system, A portion of a venting system 
using a fan or other mechanical means to cause the removal of 
flue or vent gases under positive static vent pressure. 

Induced draft venting system. A portion of a venting sys- 
tem using a fan or other mechanical means to cause the 
removal of flue or vent gases under nonpositive static vent 
pressure. 

Natural draft venting system. A venting system designed 
to remove flue or vent gases under nonpositive static vent 
pressure entirely by natural draft. 

WALL HEATER, UNVENTED-TYPE. A room heater of the 
type designed for insertion in or attachment to a wall or parti- 
tion. Such heater does not incorporate concealed venting 
arrangements in its construction and discharges all products of 
combustion through the front into the room being heated. 



SECTION C301 
GENERAL 

C301,l Scope. This chapter shall govern the approval and 
installation of all equipment and appliances that comprise parts 
of the installations regulated by this code in accordance with 
Section CI 01.1. 

Equipment and appliances shall not be installed, altered or 
used in violation of this code. The fuel input rate to equipment 



117.8 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



> 



> 



•> 



shall not be increased in excess of the approved Btu/h (W) rat- 
ing at the altitude where it is being used. 

C301.1.1 Other fuels. The requirements for combustion 
and dilution air for gas-fired appliances shall be governed 
by Section C304. The requirements for combustion and 
dilution air for appliances operating with fuels other than 
fuel gas shall be regulated by Chapter 7. 

C301.2 Energy utilization. Heating, ventilating and air-con- 
ditioning systems of all structures shall be designed and 
installed for efficient utilization of energy in accordance with 
Chapter 13 in the Oregon Structural Specialty Code. 

C301.3 Listed and labeled. Appliances regulated by this code 
shall be listed and labeled for the application in which they are 
used unless otherwise approved in accordance with Section 
105. 

C301.4 Fuel types. Appliances shall be designed for use with 
the type of fuel gas that will be supplied to them. 

€301.4.1 Appliance fuel conversion. Appliances shall not 
be converted to utilize a different fuel gas except where 
complete instructions for such conversion are provided in 
the installation instructions, by the serving gas supplier or 
by the appliance manufacturer. 



SECTION C302 
STRUCTURAL SAFETY 

C302.1 Structural safety. See Chapter 3, Section 302. 



SECTION C303 
APPLIANCE LOCATION 

C303.1 General. Appliances shall be located as required by 
this section, specific requirements elsewhere in this appendix 
and the conditions of the equipment and appliance listing. 

C303.2 Hazardous locations. Appliances shall not be located 
in a hazardous location unless listed and approved for the spe- 
cific installation. 

C303.3 Prohibited locations. Appliances shall not be located 
in sleeping rooms, bathrooms, toilet rooms, storage closets or 
surgical rooms, or in a space that opens only into such rooms or 
spaces, except where the installation complies with one of the 
following: 

1. The appliance is a direct- vent appliance installed in 
accordance with the conditions of the listing and the 
manufacturer's instructions. 

2. Vented room heaters, wall furnaces, vented decorative 
appliances, vented gas fireplaces, vented gas fireplace 
heaters and decorative appliances for installation in 
vented solid fuel-burning fireplaces are installed in 
rooms that meet the required volume criteria of Section 
C304.5. 

3. A single wall-mounted unvented room heater is installed 
in a bathroom and such unvented room heater is 
equipped as specified in Section C621 .6 and has an input 



rating not greater than 6,000 Btu/h (1 .76 kW). The bath- 
room shall meet the required volume criteria of Section 
C304.5. 

4. A single wall-mounted unvented room heater is installed 
in a bedroom and such unvented room heater is equipped 
as specified in Section C62 1 .6 and has an input rating not 
greater than 10,000 Btu/h (2.93 kW). The bedroom shall 
meet the required volume criteria of Section C304.5. 

5. The appliance is installed in a room or space that opens 
only into a bedroom or bathroom, and such room or 
space is used for no other purpose and is provided with a 
solid weather- stripped door equipped with an approved 
self-closing device. All combustion air shall be taken 
directly from the outdoors in accordance with Section 
C304.6. 

C303.4 Protection from vehicle impact damage. Appliances 
shall not be installed in a location subject to vehicle impact 
damage except where protected by an approved means (see 
Figure C304.1). 

C303.5 Indoor locations. Furnaces and boilers installed in 
closets and alcoves shall be listed for such installation. 

C303.6 Outdoor locations. Equipment installed in outdoor 
locations shall be listed for outdoor installation. <^ 

C303.7 Pit locations. Appliances installed in pits or excava- 
tions shall not come in direct contact with the surrounding soil. 
The sides of the pit or excavation shall be held back a minimum 
of 12 inches (305 mm) from the appHance. Where the depth 
exceeds 12 inches (305 mm) below adjoining grade, the walls 
of the pit or excavation shall be lined with concrete or masonry, 
such concrete or masonry shall extend a minimum of 4 inches 
(102 mm) above adjoining grade and shall have sufficient lat- 
eral load-bearing capacity to resist collapse. The appliance 
shall be protected from flooding in an approved manner. 



SECTION C304 
COMBUSTION, VENTILATION AND DILUTION AIR 

C304.1 General. Air for combustion, ventilation and dilution 
of flue gases for appliances installed in buildings shall be pro- 
vided by application of one of the methods prescribed in Sec- 
tions C304.5 through C304.9. Where the requirements of 
Section C304.5 are not met, outdoor air shall be introduced in 
accordance with one of the methods prescribed in Sections 
C304.6 through C304.9. Direct-vent appHances, gas appli- 
ances of other than natural draft design and vented gas appli- 
ances other than Category I shall be provided with combustion, 
ventilation and dilution air in accordance with the appliance 
manufacturer's instructions. 

Exception: Type 1 clothes dryers that are provided with 
makeup air in accordance with Section 504.5. 

C304.2 Appliance location. Appliances shall be located so as 
not to interfere with proper circulation of combustion, ventila- 
tion and dilution air. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.9 



< 
m 

O 
r- 

>?; 

2 O 

Og 
30 ^ 

m '-^ 

o 

O 

m 

o 
m 
o 

-I 
< 
-a 
m 

0} 

O 

Tl 
=0 

30 

o 

H 

m 
o 

H 
O 



Examples of barrier locations, when appliances are 
in the path of vehicles 



Minimum 2" sch. 40 iron pipe- 
filled with concrete 



Furnace 




© 



© @ 



Option 2: 
Wheel Barrier _ 



Vehicle 
1 



For appliances not in the path of the 
vehicles, this bollard is optional 




Vehicle 
2 




I _ _ . v' ft ' i - 
J Concrete Jslab'^.yi' 



APPENDIX C 




C304.3 Draft hood/regulator location. Where used, a draft 
hood or a barometric draft regulator shall be installed in the 
same room or enclosure as the appliance served so as to prevent 
any difference in pressure between the hood or regulator and 
the combustion air supply. 

C304.4 Makeup air provisions. Makeup air requirements for 
the operation of exhaust fans, kitchen ventilation systems, 
clothes dryers and fireplaces shall be considered in determin- 
ing the adequacy of a space to provide combustion air require- 
ments. 

C304.4.1 Special conditions; In buildings containing 
combustion appliances, equipment or fireplaces not 
equipped with forced or induced draft or separated from 
the habitable area, where an individual exhaust appliance 
exceeds 350 cubic feet per minute (cfm) (165.2L/s), 
makeup air of sufficient quantity to equal that being 
exhausted shall be supplied to the, area being ventilated. 
In such cases, the minimum size makeup air duct shall be 
6 inches (152 mm) in diameter or equivalent area. 

C304.5 Indoor combustion air. The required volume of 
indoor air shall be determined in accordance with Section 
C304.5.1 or C304.5.2, except that where the air infiltration 
rate is known to be less than 0.40 air changes per hour (ACH), 
Section C304.5.2 shall be used. The total required volume 
shall be the sum of the required volume calculated for all 
appliances located within the space. Rooms communicating 
directly with the space in which the appliances are installed 
through openings not furnished with doors, and through com- 
bustion air openings sized and located in accordance with 
Section C304.5.3, are considered to be part of the required 
volume. 

C304.5.1 Standard method. The minimum required vol- 
ume shall be 50 cubic feet per 1,000 Btu/h (4.8 m^/kW) of 
the appliance input rating. 

C304.5.2 Known air-infiltration-rate method. Where the 
air infiltration rate of a structure is known, the minimum 
required volume shall be determined as follows: 

For appliances other than fan-assisted, calculate volume 
using Equation 3-1. 



where: 

/„,ft^r = All appliances other than fan assisted (input in 
Btu/h). 

/^„„ = Fan-assisted appliance (input in Btu/h). 

ACH = Air change per hour (percent of volume of space 
exchanged per hour, expressed as a decimal). 

For purposes of this calculation, an infiltration rate 
greater than 0.60 ACH shall not be used in Equations 3-1 

and 3-2. 

C304.5.3 Indoor opening size and location. Openings 
used to connect indoor spaces shall be sized and located in 
accordance with Sections C304.5.3.1 and C304.5.3.2 (see 
Figure C304.5. 3). 



CHiMNEVWOASVENT 







Water 

Iwater 



D 



; .»__ — »— OPENING 



^ 



I 'i ' i'i'i' i'i 'i 



I I ! r I n: 



FIGURE C304.5.3 

ALL AIR FROM INSIDE THE BUILDING 

(see Section C304.5.3) 



Required Volumepther ^ 



21/r 

ACH { 1,000 Btu/hr 

(Equation 3-1) 



For fan-assisted appliances, calculate volume using 
Equation 3-2. 



Required Volumefan 



fan 



ACH\ 1,000 Btu/hr 



(Equation 3-2) 



C304.5.3.1 Combining spaces on the same story. 

Each opening shall have a minimum free area of 1 
square inch per 1,000 Btu/h (2,200 mm^/kW) of the 
total input rating of all appliances in the space, but not 
less than 100 square inches (0.06 m^). One opening 
shall commence within 12 inches (305 mm) of the top 
and one opening shall commence within 12 inches (305 
mm) of the bottom of the enclosure. The minimum 
dimension of air openings shall be not less than 3 inches 
(76 mm). 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.11 



APPENDIX C 



C304.S3.2 Combining spaces in different stories. The 
volumes of spaces in different stories shall be considered 
as communicating spaces where such spaces are con- 
nected by one or more openings in doors or floors having a 
total minimum free area of 2 square inches per 1 ,000 Btu/h 
(4402 mm^/kW) of total input rating of all appliances. 



CWfMNeyORGASVENT 



in Outdoor combustion air 
shall be provided through opening(s) to the outdoors in accor- 
dance with Section C304.6.1 or C304.6.2. The minimum 
dimension of air openings shall be not less than 3 inches (76 
mm). 

C304.6.1 Two-permanent-openings method. Two perma- 
nent openings, one commencing within 12 inches (305 mm) 
of the top and one commencing within 12 inches (305 mm) 
of the bottom of the enclosure, shall be provided. The open- 
ings shall communicate directly, or by ducts, with the out- 
doors or spaces that freely communicate with the outdoors. 

Where directly communicating with the outdoors, or 
where communicating with the outdoors through vertical 
ducts, each opening shall have a minimum free area of 1 
square inch per 4,000 Btu/h (550 mm^/kW) of total input 
rating of all appliances in the enclosure [see Figures 
C304.6.1(l) and C304.6.1(2)]. 

Where communicating with the outdoors through hori- 
zontal ducts, each opening shall have a minimum free area 
of not less than 1 square inch per 2,000 Btu/h (1,100 
mm^/kW) of total input rating of all appliances in the enclo- 
sure [see Figure C304.6.1(3)]. 



CHIMNEY OR GAS VENT 



ALTERNATE 

AIR INLET 

OPENING TO 

OUTDOORS 




VENTILATION LOUVERS 
(EACH END OF ATTIC) 



mi 



^S 



M ■ r r I 



IZ3 



rzr 



VENTILATION LOUVERS FOR^ 
UNHEATED CRAWL SPACE 



FIGURE C304.6.1(1) 

ALL AIR FROM OUTDOORS— INLET AIR FROM VENTILATED 

CRAWL SPACE AND OUTLET AIR TO VENTILATED ATTIC 

(see Section C304.6.1) 




V^NTtUa'tOW tOUVBRS. 
(EACHENOOFATnC) 



OUTLET WR 



JNUET AIR DUCT 

<eNOStPOOT|aiSMM) 
ABOVE FLOOR) 



s: 



till! 



For SI: 1 foot = 304.8 mm. 

FIGURE 0304.6.1(2) 

ALL AIR FROM OUTDOORS THROUGH VENTILATED ATTIC 

(see Section C304.6.1) 



-CHIMNEY OR GAS VENT 




rz: 



rzj 



FIGURE C304.6.1 (3) 

ALL AIR FROM OUTDOORS 

(see Section C304.6.1) 

C304.6.2 One-permanent-opening method. One perma- 
nent opening, commencing Within 12 inches (305 mm) of the 
top of the enclosure, shall be provided. The appliance shall 
have clearances of at least 1 inch (25 mm) from the sides and 
back cind 6 inches (152 mm) from the front of the appliance. 
The opening shall directly communicate with the outdoors or 
through a vertical or horizontal duct to the outdoors, or spaces 
that freely communicate with the outdoors (see Figure 
C304.6.2) and shall have a minimum free area of 1 square 
inch per 3,000 Btu/h (734 mm^/kW) of the total input rating 
of all appliances located in the enclosure and not less than the 
sum of the areas of all vent connectors in the space. 



117.12 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



CHIMNEV OR GAS VEfIT 







FIGURE C304.6.2 

SINGLE COMBUSTION AIR OPENING, 

ALL AIR FROM THE OUTDOORS 

(see Section 0304.6.2) 



C304.7 Combination indoor and outdoor combustion air. 

The use of a combination of indoor and outdoor combustion air 
shall be in accordance with Sections C304.7.1 through 
C304.7.3. 

C304.7.1 Indoor openings. Where used, openings con- 
necting the interior spaces shall comply with Section 
C304.5.3. 

C304.7.2 Outdoor opening location. Outdoor opening(s) 
shall be located in accordance with Section C304.6. 

C304.7.3 Outdoor opening(s) size. The outdoor opening(s) 
size shall be calculated in accordance with the following: 

1 . The ratio of interior spaces shall be the available vol- 
ume of all communicating spaces divided by the 
required volume. 

2. The outdoor size reduction factor shall be one minus 
the ratio of interior spaces. 

3. The minimum size of outdoor opening(s) shall be the 
full size of outdoor opening(s) calculated in accor- 
dance with Section C304.6, multiplied by the reduc- 
tion factor. The minimum dimension of air openings 
shall be not less than 3 inches (76 mm). 

C304.8 Engineered installations. Engineered combustion air 
installations shall provide an adequate supply of combustion, 
ventilation and dilution air and shall be approved. 

C304.9 Mechanical combustion air supply. Where all com- 
bustion air is provided by a mechanical air supply system, the 
combustion air shall be supplied from the outdoors at a rate not 
less than 0.35 cubic feet per minute per 1,000 Btu/h (0.034 
m^/min per kW) of total input rating of all appliances located 
within the space. 

C304.9.1 Makeup air. Where exhaust fans are installed, 
makeup air shall be provided to replace the exhausted air. 



C304.9.2 Appliance interlock. Each of the appliances 
served shall be interlocked with the mechanical air supply 
system to prevent main burner operation when the mechani- 
cal air supply system is not in operation. 

C304.9.3 Combined combustion air and ventilation air 
system. Where combustion air is provided by the building's 
mechanical ventilation system, the system shall provide the 
specified combustion air rate in addition to the required ven- 
tilation air. 

C304.10 Louvers and grilles. The required size of openings for 
combustion, ventilation and dilution air shall be based on the net 
free area of each opening. Where the free area through a design 
of louver, grille or screen is known, it shall be used in calculating 
the size opening required to provide the free area specified. 
Where the design and free area of louvers and grilles are not 
known, it shall be assumed that wood louvers will have 25 -per- 
cent free area and metal louvers and grilles will have 75 -percent 
free area. Screens shall have a mesh size not smaller than V4 inch 
(6.4 mm). Nonmotorized louvers and grilles shall be fixed in the 
open position. Motorized louvers shall be interlocked with the 
apphance so that they are proven to be m the full open position 
prior to main burner ignition and during main burner operation. 
Means shall be provided to prevent the main burner from ignit- 
ing if the louvers fail to open during burner start-up and to shut 
down the main burner if the louvers close during operation. 

C304.ll Combustion air ducts. Combustion air ducts shall 
comply with all of the following: 

1 . Ducts shall be constructed of galvanized steel complying 
with Chapter 6 of the Mechanical Code or of a material 
having equivalent corrosion resistance, strength and 
rigidity. 

Exception: Within dwellings units, unobstructed 
stud and joist spaces shall not be prohibited from con- 
veying combustion air, provided that not more than 
one required fireblock is removed. 

2. Ducts shall terminate in an unobstructed space allowing 
free movement of combustion air to the appliances. 

3. Ducts shall serve a single enclosure. 

4. Ducts shall not serve both upper and lower combustion 
air openings where both such openings are used. The 
separation between ducts serving upper and lower com- 
bustion air openings shall be maintained to the source of 
combustion air. 

5. Ducts shall not be screened where terminating in an attic 
space. 

6. Horizontal upper combustion air ducts shall not slope 
downward toward the source of combustion air. 

7. The remaining space surrounding a chimney liner, gas 
vent, special gas vent or plastic piping installed within a 
masonry, metal or factory-built chimney shall not be 
used to supply combustion air. 

Exception: Direct-vent gas-fired appliances 
designed for installation in a solid fuel-burning fire- 
place where installed in accordance with the manu- 
facturer's instructions. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.13 



APPENDIX C 



8. Combustion air intake openings located on the exterior 
of a building shall have the lowest side of such openings 
located not less than 12 inches (305 mm) vertically from 
the adjoining grade level. 

C304.12 Protection from fumes and gases. Where corrosive 
or flammable process fumes or gases, other than products of 
combustion, are present, means for the disposal of such fumes 
or gases shall be provided. Such fumes or gases include carbon 
monoxide, hydrogen sulfide, ammonia, chlorine and 
halogenated hydrocarbons. 

In barbershops, beauty shops and other facilities where 
chemicals that generate corrosive or flammable products, such 
as aerosol sprays, are routinely used, nondirect vent-type appli- 
ances shall be located in a mechanical room separated or parti- 
tioned off from other areas with provisions for combustion air 
and dilution air from the outdoors. Direct- vent appliances shall 
be installed in accordance with the appliance manufacturer's 
installation instructions. 



SECTBON C305 
INSTALLATION 

C305.1 General. Equipment and appliances shall be installed 
as required by the terms of their approval, in accordance with 
the conditions of listing, the manufacturer's instructions and 
this code. Manufacturers' installation instructions shall be 
available on the job site at the time of inspection. Where a code 
provision is less restrictive than the conditions of the listing of 
the equipment or appliance or the manufacturer's installation 
instmctions, the conditions of the listing and the manufac- 
turer's installation instructions shall apply. 

Unlisted appliances approved in accordance with Section 
C301 .3 shall be limited to uses recommended by the manufac- 
turer and shall be installed in accordance with the manufac- 
turer's instructions, the provisions of this code and the 
requirements determined by the code official. 

C305.2 Hazardous area. Equipment and appliances having an 
ignition source shall not be installed in Group H occupancies or 
control areas where open use, handling or dispensing of com- 
bustible, flammable or explosive materials occurs. 

C305.3 Elevation of ignition source. Heating and/or cooling 
equipment and water heaters covered by this code, located in a 
garage and which generate a glow, spark or flame capable of 
igniting flammable vapors shall be installed with sources of 
ignition at least 1 8 inches (457 mm) above the floor level. 

Exception; Elevation of the ignition source is not required 
for appliances that are listed as flammable vapor ignition 
resistant. 

C305.3.1 Parking garages. Connection of a parking 
garage with any room in which there is a fuel-fired appli- 
ance shall be by means of a vestibule providing a two-door- 
way separation, except that a single door is permitted where 
the sources of ignition in the appliance are elevated in accor- 
dance with Section C305.3. 

Exception: This section shall not apply to appliance 
installations complying with Section C305.4. 



C305.4 Public garages. Appliances located in public garages, 
motor fuel-dispensing facilities, repair garages or other areas 
frequented by motor vehicles shall be installed a minimum of 8 
feet (2438 mm) above the floor. Where motor vehicles exceed 6 
feet (1829 mm) in height and are capable of passing under an 
apphance, appliances shall be installed a minimum of 2 feet (610 
mm) higher above the floor than the height of the tallest vehicle. 

Exception: The requirements of this section shall not apply 
where the appliances are protected from motor vehicle 
impact and installed in accordance with Section C305.3. 



5S.S Private garages. Appliances located in private 
garages shall be installed with a minimum clearance of 6 feet 
(1829 mm) above the floor. 

Exception: The requirements of this section shall not apply 
where the appliances are protected from motor vehicle 
impact and installed in accordance with Section C305.3 (see 
Figure C304.1). 

C30S.6 Construction and protection. Boiler rooms and fur- 
nace rooms shall be protected as required by the Building 
Code. 

C305.7 Clearances from grade. Equipment and appliances 
installed at grade level shall be supported on a level concrete 
slab or other approved material extending above adjoining 
grade or shall be suspended a minimum of 6 inches (152 mm) 
above adjoining grade. 

C30S.8 Clearances to combustible construction. Heat-pro- 
ducing equipment and appliances shall be installed to maintain 
the required clearances to combustible construction as speci- 
fied in the listing and manufacturer's instructions. Such clear- 
ances shall be reduced only in accordance with Section C308. 
Clearances to combustibles shall include such considerations 
as door swing, drawer pull, overhead projections or shelving 
and window swing. Devices, such as door stops or limits and 
closers, shall not be used to provide the required clearances. 



SECTBON C306 
ACCESS AND SERVICE SPACE 

C306.1 Clearances for maintenance and replacement. Clear- 
ances around appliances to elements of permanent construction, 
including other installed appliances, shall be sufficient to allow 
inspection, service, repair or replacement without removing 
such elements of permanent construction or disabUng the func- 
tion of a required fire-resistance-rated assembly. 

C306.2 Appliances in rooms. Rooms containing appliances 
requiring access shall be provided with a door and an unob- 
structed passageway measuring not less than 36 inches (914 
mm) wide and 80 inches (2032 mm) high. 

Exception: Within a dwelling unit, appliances installed in a 
compartment, alcove, basement or similar space shall be 
provided with access by an opening or door and an unob- 
structed passageway measuring not less than 24 inches (610 
mm) wide and large enough to allow removal of the largest 
appliance in the space, provided that a level service space of 
not less than 30 inches (762 mm) deep and the height of the 
appliance, but not less than 30 inches (762 mm), is present at 
the front or service side of the appliance with the door open. 



1117.14 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



C306.3 Appliances in attics. Attics containing appliances 
requiring access shall be provided with an opening and 
unobstructed passageway large enough to allow removal of 
the largest component of the appliance. The passageway 
shall not be less than 30 inches (762 mm) high and 22 inches 
(559 mm) wide and not more than 20 feet (6096 mm) in 
length when measured along the centerline of the passage- 
way from the opening to the equipment. The passageway 
shall have continuous solid flooring not less than 24 inches 
(610 mm) wide. A level service space not less than 30 inches 
(762 mm) deep and 30 inches (762 mm) wide shall be pres- 
ent at the front or service side of the equipment. The clear 
access opening dimensions shall be a minimum of 20 inches 
by 30 inches (508 mm by 762 mm), where such dimensions 
are large enough to allow removal of the largest component 
of the appliance. 

Exceptions: 

1. The passageway and level service space are not 
required where the appliance is capable of being 
serviced and removed through the required open- 
ing. 

2. Where the passageway is not less than 6 feet (1829 
mm) high for its entire length, the passageway shall 
be not greater than 50 feet (15 250 mm) in length. 

C306.3.1 Electrical requirements. A luminaire controlled 
by a switch located at the required passageway opening and 
a receptacle outlet shall be provided at or near the equipment 
location in accordance with the Electrical Code. 

C306.4 Appliances under floors. Under-floor spaces contain- 
ing appliances requiring access shall be provided with an 
access opening and unobstructed passageway large enough to 
remove the largest component of the appliance; The passage- 
way shall not be less than 30 inches (762 mm) high and 22 
inches (559 mm) wide, nor more than 20 feet (6096 mm) in 
length when measured along the centerline of the passageway 
from the opening to the equipment. A level service space not 
less than 30 inches (762 mm) deep and 30 inches (762 mm) 
wide shall be present at the front or service side of the appli- 
ance. If the depth of the passageway or the service space 
exceeds 12 inches (305 mm) below the adjoining grade, the 
walls of the passageway shall be lined with concrete or 
masonry extending 4 inches (102 mm) above the adjoining 
grade and having sufficient lateral-bearing capacity to resist 
collapse. The clear access opening dimensions shall be a mini- 
mum of 22 inches by 30 inches (559 mm by 762 mm), where 
such dimensions are large enough to allow removal of the larg- 
est component of the appliance. 

Exceptions: 

1. The passageway is not required where the level ser- 
vice space is present when the access is open and the 
appliance is capable of being serviced and removed 
through the required opening. 

2. Where the passageway is not less than 6 feet high 
(1829 mm) for its entire length, the passageway shall 
not be hmited in length. 

C306.4.1 Electrical requirements. A luminaire controlled 
by a switch located at the required passageway opening and 



a receptacle outlet shall be provided at or near the equipment 
location in accordance with the Electrical Code. 

C306.5 Appliances on roofs or elevated structures. Where 
appliances requiring access are installed on roofs or elevated 
structures at a height exceeding 16 feet (4877 mm), such 
access shall be provided by a permanent approved means of 
access, the extent of which shall be from grade or floor level 
to the appliance's level service space. Such access shall not 
require climbing over obstructions greater than 30 inches 
high (762 mm) or walking on roofs having a slope greater 
than four units vertical in 12 units horizontal (33-percent 
slope). 

Exception: This section shall not apply to the replacement, 
repair or maintenance of an existing appliance or piece of 
equipment lawfully in existence at the time of the adoption 
of this code. 

Permanent ladders installed to provide the required access 
shall comply with the following minimum design criteria. 

1 . The side railing shall extend above the parapet or roof 
edge not less than 30 inches (762 mm). 

2. Ladders shall have a rung spacing not to exceed 14 
inches (356 mm) on center. 

3. Ladders shall have a toe spacing not less than 6 inches 
(152 mm) deep. 

4. There shall be a minimum of 18 inches (457 mm) 
between rails. 

5. Rungs shall have a minimum diameter of 0.75-inch (19 
mm) and shall be capable of withstanding a 300-pound 
(136.1 kg) load. 

6. Ladders over 30 feet (9144 mm) in height shall be pro- 
vided with offset sections and landings capable of with- 
standing a load of 100 pounds per square foot (488.2 
kg/m2). 

7. Ladders shall be protected against corrosion by 
approved means. 

Catwalks installed to provide the required access shall be not 
less than 24 inches wide (610 mm) and shall have railings as 
required for service platforms. 

Exception: This section shall not apply to Group R-3 occu- 
pancies. 

C306.5.1 Sloped roofs. Where apphances are installed on a 
roof having a slope of three units vertical in 12 units hori- 
zontal (25 -percent slope) or greater and having an edge 
more than 30 inches (762 mm) above grade at such edge, a 
level platform shall be provided on each side of the appli- 
ance to which access is required for service, repair or main- 
tenance. The platform shall not be less than 30 inches (762 
mm) in any dimension and shall be provided with guards. 
The guards shall extend not less than 42 inches (1067 mm) 
above the platform, shall be constructed so as to prevent the 
passage of a 21 -inch-diameter (533 mm) sphere and shall 
comply with the loading requirements for guards specified 
in the Building Code. 

Exception: This section shall not apply to the replace- 
ment, repair or maintenance of an existing appliance or 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.15 



APPENDIX C 



piece of equipment lawfully in existence at the time of 
the adoption of this code. 

1.5.2 Electrical reqelrements. A receptacle outlet 
shall be provided at or near the equipment location in accor- 
dance with the Electrical Code. 

C306.6 Guards. Guards shall be provided where appliances or 

> other components that require service are located within 1 feet 
(3048 mm) of a roof edge or open side of a walking surface and 
such edge or open side is located more than 30 inches (762 mm) 
above the floor, roof or grade below. The guard shall extend not 
less than 30 inches (762 mm) beyond each end of such appli- 

> ances, components and the top of the guard shall be located not 
less than 42 inches (1067 mm) above the elevated surface adja- 
cent to the guard. The guard shall be constructed so as to pre- 
vent the passage of a 21 -inch-diameter (533 mm) sphere and 
shall comply with the loading requirements for guards speci- 
fied in the Building Code. 

Exceptioe: This section shall not apply to the replacement, 
repair or maintenance of an existing appliance or piece of 
equipment lawfully in existence at the time of the adoption 
of this code. 



CONDENSATE DISPOSAL 

Note: For addntioeal information on condensate disposal see 
Chapter 3, Section 307. 

C307.1 Evaporators and coolieg coils. Condensate drainage 
systems shall be provided for equipment and appliances con- 
taining evaporators and cooling coils in accordance with Sec- 
tions 307 and C307. 

C3([])7,2 Feel-bereimig appliamces. Liquid combustion 
by-products of condensing appliances shall be collected and 
discharged to an approved plumbing fixture or disposal area in 
accordance with the manufacturer's installation instructions. 
Condensate piping shall be of approved corrosion-resistant 
material and shall not be smaller than the drain connection on 
the appliance. Such piping shall maintain a minimum slope in 
the direction of discharge of not less than one-eighth unit verti- 
cal in 12 units horizontal (1 -percent slope). 

C3(D)7.3 Draie pipe materials and sizes. Components of the 
condensate disposal system shall be cast iron, galvanized steel, 
copper, polybutylene, polyethylene, ABS, CPVC or PVC pipe 
or tubing. All components shall be selected for the pressure and 
temperature rating of the installation. Condensate waste and 
drain line size shall be not less than ^/4-inch internal diameter 
(19 mm) and shall not decrease in size from the drain connec- 
tion to the place of condensate disposal. Where the drain pipes 
from more than one unit are manifolded together for conden- 
sate drainage, the pipe or tubing shall be sized in accordance 
with an approved method. All horizontal sections of drain pip- 
ing shall be installed in uniform alignment at a uniform slope. 

C3(0)7.4 Traps. Condensate drains shall be trapped as required 
by the equipment or appliance manufacturer. 

C3(D7.5 Auxiliary drain pan. Category IV condensing appli- 
ances shall be provided with an auxiliary drain pan where dam- 



age to any building component will occur as a result of stoppage 
in the condensate drainage system. Such pan shall be installed in 
accordance with the applicable provisions of Section C307. 

Exception: An auxiliary drain pan shall not be required for 
appliances that automatically shut down operation in the 
event of a stoppage in the condensate drainage system. 



SECTION C308 
CLEARANCE REDUCTION 

C308.1 Scope. This section shall govern the reduction in 
required clearances to combustible materials and combustible 
assemblies for chimneys, vents, appliances, devices and equip- 
ment. Clearance requirements for gas-fired air-conditioning 
equipment and gas-fired central heating boilers and furnaces 
shall comply with Sections C308.3 and C308.4. 

C308.2 Reduction table. The allowable clearance reduction 
shall be based on one of the methods specified in Table C308.2 
or shall utilize an assembly listed for such application. Where 
required clearances are not listed in Table C308.2, the reduced 
clearances shall be determined by linear inte]*polation between 
the distances listed in the table. Reduced cleai^ances shall not be 
derived by extrapolation below the range of the table. The 
reduction of the required clearances to combustibles for listed 
and labeled appliances and equipment shall be in accordance 
with the requirements of this section except that such clear- 
ances shall not be reduced where reduction is specifically pro- 
hibited by the terms of the apphance or equipment listing [see 
Figures C308.2(l) through C308.2(3)]. 

C308.3 Clearances for indoor air-conditioning appliances. 
Clearance requirements for indoor air-conditioning appliances 
shall comply with Sections C308.3.1 through C308.3.5. 

C308.3.1 Appliances installed in rooms that are large in 
comparison with the size of the appliance. Air-condition- 
ing appliances installed in rooms that are large in comparison 
with the size of the appliance shall be installed with clear- 
ances in accordance with the manufacturer's instructions. 

C308.3.2 Appliances installed in rooms that are not large 
in comparison with the size of the appliance. Air-condi- 
tioning appliances installed in rooms that are not large in 
comparison with the size of the appliance, such as alcoves 
and closets, shall be listed for such installations and installed 
in accordance with the manufacturer's instructions. Listed 
clearances shall not be reduced by the protection methods 
described in Table C308.2, regardless of whether the enclo- 
sure is of combustible or noncombustible material. 

C308.3.3 Clearance reduction. Air-conditioning appli- 
ances installed in rooms that are large in comparison with 
the size of the appliance shall be permitted to be installed 
with reduced clearances to combustible material, provided 
the combustible material or appliance is protected as 
described in Table C308.2. 

C308.3.4 Plenum clearances. Where the furnace plenum is 
adjacent to plaster on metal lath or noncombustible material 
attached to combustible material, the cleariince shall be mea- 
sured to the surface of the plaster or other noncombustible fin- 
ish where the clearance specified is 2 inches (5 1 mm) or less. 



117.16 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



TABLE C308.2^ **"°"^*' " 
REDUCTION OF CLEARANCES WITH SPECIFIED FORMS OF PROTECTION 



TYPE OF PROTECTION APPLIED TO 

AND COVERING ALL SURFACES OF COMBUSTIBLE 

MATERIAL WITHIN THE DISTANCE SPECIFIED AS THE 

REQUIRED CLEARANCE WITH NO PROTECTION 

[see Figures C308.2(1), C308.2(2), and C308.2(3)] 


WHERE THE REQUIRED CLEARANCE WITH NO PROTECTION FROM 
APPLIANCE, VENT CONNECTOR, OR SINGLE-WALL METAL PIPE IS: (inches) 


36 


18 


12 


9 


6 


Allowable clearances with specified protection (inches) 


Use Column 1 for clearances above appliance or horizontal connector. Use Column 2 
for clearances from appliance, vertical connector, and single-wall metal pipe. 


Above 
Col. 1 


Sides 

and rear 

Col. 2 


Above 
Col. 1 


Sides 

and rear 

Col. 2 


Above 
Col. 1 


Sides 

and rear 

Col. 2 


Above 
Col. 1 


Sides 

and rear 

Col. 2 


Above 
Col. 1 


Sides 

and rear 

Col. 2 


1. 3 'A- inch-thick masonry wall without ventilated air- 
space 


— 


24 


— 


12 


— 


9 


— 


6 




5 


2. '/2-inch insulation board over 1-inch glass fiber or 
mineral wool batts 


24 


18 


12 


9 


9 


6 


6 


5 


4 


3 


3 . 0.024-inch (nominal 24 gage) sheet metal over 1 -inch 
glass fiber or mineral wool batts reinforced with wire 
on rear face with ventilated airspace 


18 


12 


9 


6 


6 


4 


5 


3 


3 


3 


4. S'A-inch-thick masonry wall with ventilated air- 
space 


— 


12 


— 


6 


— 


6 


— 


6 




6 


5. 0.024-inch (nominal 24 gage) sheet metal with ven- 
tilated airspace 


18 


12 


9 


6 


6 


4 


5 


3 


3 


2 


6. '/2-inch-thick insulation board with ventilated air- 
space 


18 


12 


9 


6 


6 


4 


5 


3 


3 


3 


7. 0.024-inch (nominal 24 gage) sheet metal with ven- 
tilated airspace over 0.024-inch (nominal 24 gage) 
sheet metal with ventilated airspace 


18 


12 


9 


6 


6 


4 


5 


3 


3 


3 


8. 1 -inch glass fiber or mineral wool batts sandwiched 
between two sheets 0.024-inch (nominal 24 gage) 
sheet metal with ventilated airspace 


18 


12 


9 


6 


6 


4 


5 


3 


3 


3 



For SI: 1 inch = 25.4 mm, °C = [(°F - 32)/1.8], 1 pound per cubic foot = 16.02 kgti\ I Btu per inch per square foot per hour per °F = 0.144 WAn^ x K. 

a. Reduction of clearances from combustible materials shall not interfere with combustion air, draft hood clearance and relief, and accessibility of servicing. 

b. All clearances shall be measured from the outer surface of the combustible material to the nearest point on the surface of the appliance, disregarding any interven- 
ing protection applied to the combustible material. 

c. Spacers and ties shall be of noncombustible material. No spacer or tie shall be used directly opposite an appliance or connector 

d. For all clearance reduction systems using a ventilated airspace, adequate provision for air circulation shall be provided as described [see Figures C308.2(2) and 
C308.2(3)]. 

e. There shall be at least 1 inch between clearance reduction systems and combustible walls and ceilings for reduction systems using ventilated airspace. 

f. Where a wall protector is mounted on a single flat wall away from comers, it shall have a minimum 1-inch air gap. To provide air circulation, the bottom and top 
edges, or only the side and top edges, or all edges shall be left open. 

g. Mineral wool batts (blanket or board) shall have a minimum density of 8 pounds per cubic foot and a minimum melting point of 1500°E 

h. Insulation material used as part of a clearance reduction system shall have a thermal conductivity of 1.0 Btu per inch per square foot per hour per °F or less. 
i. There shall be at least 1 inch between the appliance and the protector In no case shall the clearance between the appliance and the combustible surface be reduced 

below that allowed in this table, 
j. All clearances and thicknesses are minimum; larger clearances and thicknesses are acceptable, 
k. Listed single-wall connectors shall be installed in accordance with the manuiacturer's installation instructions. 



• 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.17 



APPENDIX C 



CONSTRUCTION USING COMBUSTIBLE- 
MATERIAL, PLASTERED OR UNPLASTERED 




SHEET METAL 
OR OTHER 
PROTECTION 



"A" equals the reduced clearance with no protection. 

"B" equals the reduced clearance permitted in accordance with Table 
C308.2. The protection applied to the construction using combustible 
material shall extend far enough in each direction to make "C" equal 
to "A." 



FIGURE C308.2(1) 

EXTENT OF PROTECTION NECESSARY TO 

REDUCE CLEARANCES FROM APPLIANCE OR 

VENT CONNECTIONS 



1-INCH MINIMUM 
AIRSPACE BETWEEN 
MASONRY AND 
COMBUSTIBLE WALL 



COMBUSTIBLE WALL 



BOnOM AND TOP COURSE 
OF BRICKS STAGGERED 
FOR VENTILATION 



A STRIP OF HEAVY-GAUGE STEEL 
USED FOR ADDED SUPPORT 

NOTE: DO NOT PUCE MASONRY 
WALL TIES DIRECTLY BEHIND 
APPLIANCE OR CONNECTOR 




For SI: 1 inch = 25.4 mm. 



CORRUGATED 
METAL WALL 
TIES 



FIGURE C308.2(3) 
MASONRY CLEARANCE REDUCTION SYSTEM 




\NALl PROTECTOR MOUNTED 
WITH ALL EDGES OPEN 





WALL PROTECTOR MOUNTED 
ON SINGLE FLAT WALL 



MUST BE MOUNTED 
WITH TOP AND BOTTOM 
EDGES OPEN 



WALL PROTECTOR INSTALLED 
IN CORNER 



MOUNTED WITH SIDE 
AND TOP EDGES OPEN 



MOUNTED WITH TOP 
AND BOTTOM EDGES 
OPEN 



-^^ 



COMBUSTIBLE 
WALL 






^ 



1 INCH 



AIR- 
SPACE 



^Omw^m ' 



]- 



NAIL OR SCREW 
ANCHOR 



CLEARANCE 
REDUCTION SYSTEM 



1-INCH NONCOMBUSTIBLE SPACER SUCH AS STACKED WASHERS, SMALL- 
DIAMETER PIPE, TUBING OR ELECTRICAL CONDUIT. 



For SI: 1 inch = 25.4 mm. 



MASONRY WALLS CAN BE ATTACHED TO COMBUSTIBLE WALLS USING WALL TIES. 
DO NOT USE SPACERS DIRECTLY BEHIND APPLIANCE OR CONNECTOR. 



FIGURE C308.2(2) 
WALL PROTECTOR CLEARANCE REDUCTION SYSTEM 



117.18 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



C308.3.5 Clearance from supply ducts. Air-conditioning 
appliances shall have the clearance from supply ducts 
within 3 feet (914 mm) of the furnace plenum be not less 
than that specified from the furnace plenum. Clearance is 
not necessary beyond this distance. 



A Central-heating boilers and furnaces. Clearance 
requirements for central-heating boilers and furnaces shall 
comply with Sections C308.4.1 through C308.4.6. The clear- 
ance to these appliances shall not interfere with combustion air; 
draft hood clearance and relief; and accessibility for servicing. 

C308.4.1 Appliances installed in rooms that are large in 
comparison with the size of the appliance. Central-heat- 
ing furnaces and low-pressure boilers installed in rooms 
large in comparison with the size of the appliance shall be 
installed with clearances in accordance with the manufac- 
turer's instructions. 

C308.4.2 Appliances installed in rooms that are not lai^e 
in comparison with the size of the appliance. Central-heat- 
ing furnaces and low-pressure boilers installed in rooms that 
are not large in comparison with the size of the appliance, 
such as alcoves and closets, shall be listed for such installa- 
tions. Listed clearances shall not be reduced by the protection 
methods described in Table C308.2 and illustrated in Figures 
C308.2(l) through C308.2(3), regardless of whether the 
enclosure is of combustible or noncombustible material. 

C308.4.3 Clearance reduction. Central-heating furnaces 
and low-pressure boilers installed in rooms that are large in 
comparison with the size of the appliance shall be permitted 
to be installed with reduced clearances to combustible mate- 
rial provided the combustible material or appliance is pro- 
tected as described in Table C308.2. 

C308.4.4 Clearance for servicing appliances. Front clear- 
ance shall be sufficient for servicing the burner and the fur- 
nace or boiler. 

C3(Ii8.4.5 Plenum clearances. Where the furnace plenum is 
adjacent to plaster on metal lath or noncombustible material 
attached to combustible material, the clearance shall be mea- 
sured to the surface of the plaster or other noncombustible fin- 
ish where the clearance specified is 2 inches (5 1 mm) or less. 

C308.4.6 Clearance from supply ducts. Central-heating 
furnaces shall have the clearance from supply ducts within 3 
feet (914 mm) of the furnace plenum be not less than that 
specified from the furnace plenum. No clearance is neces- 
sary beyond this distance. 



SECTION C309 
ELECTRICAL 

C309.1 Grounding, Gas piping shall not be used as a ground- 
ing electrode. 

C309.2 Connections. Electrical connections between equip- 
ment and the building wiring, including the grounding of the 
equipment, shall conform to the Electrical Code. 



SECTION C310 
ELECTRICAL BONDING 

C310.1 Gas pipe bonding. Each above-ground portion of a gas 
piping system that is likely to become energized shall be electri- 
cally continuous and bonded to an effective ground-fault current 
path. Gas piping shall be considered to be bonded where it is 
connected to appliances that are connected to the equipment 
grounding conductor of the circuit supplying that appliance. 



SECTION C401 
GENERAL 

C401.1 Scope. This section shall govern the installation and 
modification of piping systems. The applicability of this code 
to piping systems extends from the point of delivery to the con- 
nections with the equipment and includes the design, materials, 
components, fabrication, assembly, installation, testing and 
inspection of such piping systems. 

C401.1.1 Utility piping systems located within buildings. 

Utility service piping located within buildings shall be 
installed in accordance with the structural safety and fire 
protection provisions of the Building Code. 

C401.2 Liquefied petroleum gas storage. The storage system 
for liquefied petroleum gas shall be designed and installed in 
accordance with the Fire Code and NFPA 58. 

C401.2.1 Notice of installation. A "Notice of Installation" 
is required by the State Fire Marshal for all LP-gas tank 
installations. For installation requirements of LP-gas tanks 
and tubing or piping up to the first stage regulator, see Chap- 
ter 38 of the Fire Code. 

C401.3 Modifications to existing systems. In modifying or 
adding to existing piping systems, sizes shall be maintained in 
accordance with this chapter. 

C401.4 Additional appliances. Where an additional apph- 
ance is to be served, the existing piping shall be checked to 
determine if it has adequate capacity for all appliances served. 
If inadequate, the existing system shall be enlarged as required 
or separate piping of adequate capacity shall be provided. 

C401.5 Identification. For other than steel pipe, exposed pip- 
ing shall be identified by a yellow label marked "Gas" in black 
letters. The marking shall be spaced at intervals not exceeding 
5 feet (1524 mm). The marking shall not be required on pipe 
located in the same room as the equipment served. 

C401.6 Interconnections. Where two or more meters are 
installed on the same premises but supply separate consumers, 
the piping systems shall not be interconnected on the outlet side 
of the meters. 

C401.7 Piping meter identification. Piping from multiple 
meter installations shall be marked with an approved perma- 
nent identification by the installer so that the piping system 
supplied by each meter is readily identifiable. 

C401.8 Minimum sizes. All pipe utilized for the installation, 
extension and alteration of any piping system shall be sized to 
supply the full number of outlets for the intended purpose and 
shall be sized in accordance with Section C402. 



< 



< 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.19 



APPENDIX C 



> 



PIPE SIZING 

€402,1 General considerations. Piping systems shall be of 
such size and so installed as to provide a supply of gas suffi- 
cient to meet the maximum demand without undue loss of pres- 
sure between the point of delivery and the appliance. 

C402.2 Maximum gas demand., The volume of gas to be pro- 
vided, in cubic feet per hour, shall be determined directly from 
the manufacturer's input ratings of the appliances served. 
Where an input rating is not indicated, the gas supplier, appli- 
ance manufacturer or a qualified agency shall be contacted, or 
the rating from Table C402.2 shall be used for estimating the 
volume of gas to be supplied. 

The total connected hourly load shall be used as the basis for 
pipe sizing, assuming that all appliances could be operating at 
full capacity simultaneously. Where a diversity of load can be 
established, pipe sizing shall be permitted to be based on such 
loads. 

C4023 Sizing. Gas piping shall be sized in accordance with 
one of the following: 

1. Pipe sizing tables or sizing equations in accordance with 
Section C402.4. 

2. The sizing tables included in a listed piping system's 
manufacturer's installation instructions. 

3. Other approved methods. 

C402.4 Sizing tables and equations. Where Tables C402.4(l) 
through C402.4(35) are used to size piping or tubing, the pipe 
length shall be determined in accordance with Section 
C402.4.1, C402.4.2 or C402.4.3. 

Where Equations 4-1 and 4-2 are used to size piping or tub- 
ing, the pipe or tubing shall have smooth inside walls and the 
pipe length shall be determined in accordance with Section 
C402.4.1, C402.4.2 or C402.4.3. 

1. Low-pressure gas equation [Less than 1.5 pounds per 
square inch (psi) (10.3 kPa)]: 



TABLE C402.2 
APPROXIMATE GAS INPUT FOR TYPICAL APPLIANCES 



D = 



Q' 



19.17 



AH 
CxL 



(Equation 4-1) 



2. High-pressure gas equation [1.5 psi (10.3 kPa) and 
above]: 



D = 



Q' 



18.93 



P,'-F.'llx7l 



(Equation 4-2) 



C.xL 



where: 

D = Inside diameter of pipe, inches (mm). 



APPLIANCE 


INPUT BTU/H 
(Approx.) 


Space Heating Units 

Hydronic boiler 
Single family 
Multifamily, per unit 

Warm-air furnace 
Single family 
Multifamily, per unit 


100,000 
60,000 

100,000 
60,000 


Space and Water Heating Units 

Hydronic boiler 
Single family 
Multifamily, per unit 


120,000 
75,000 


Water Heating Appliances 

Water heater, automatic instantaneous 

Capacity at 2 gal./minute 

Capacity at 4 gal./minute 

Capacity at 6 gal./minute 
Water heater, automatic storage, 30-to 40-gal. tank 
Water heater, automatic storage, 50-gal. tank 
Water heater, domestic, circulating or side-arm 


142,800 
285,000 
428,400 
35,000 
50,000 
^ 35,000 


Cooking Appliances 

Built-in oven or broiler unit, domestic 
Built-in top unit, domestic 
Range, free-standing, domestic 


25,000 
40,000 
65,000 


Other Appliances 

Barbecue 

Clothes dryer. Type 1 (domestic) 

Gas fireplace, direct-vent 

Gas light 

Gas log 

Refrigerator 


40,000 
35,000 
40,000 
2,500 
80,000 
3,000 



For SI: 1 British thermal unit per hour = 0.293 W, 1 gallon = 3.785 L, 
1 gallon per minute = 3.785 L/m. 



Q = Input rate appliance(s), cubic feet per hour at 60°F 
(16°C) and 30-inch mercury column 

P, = Upstream pressure, psia (P^ + 14.7) 

Pj = Downstream pressure, psia (P2 + 14.7) 

L = Equivalent length of pipe, feet 

AH = Pressure drop, inch water column (27.7 inch water col- 
umn = 1 psi) 

TABLE C402.4 

C, AND y VALUES FOR NATURAL GAS AND 

UNDILUTED PROPANE AT STANDARD CONDITIONS 



GAS 


EQUATION FACTORS 


Cr 


/ 


Natural gas 


0.6094 


0.9992 


Undiluted propane 


1.2462 


0.9910 



For SI: 1 cubic foot = 0.028 m^, 1 foot = 305 mm, 1-inch water column = 
0.249 kPa, 1 pound per square inch = 6.895 kPa, 1 British thermal 
unit per hour = 0.293 W. 



117.20 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



C402.4.1 Longest length method. The pipe size of each 
section of gas piping shall be determined using the longest 
length of piping from the point of delivery to the most 
remote outlet and the load of the section. 

C402.4.2 Branch length method. Pipe shall be sized as fol- 
lows: 

1 . Pipe size of each section of the longest pipe run from 
the point of delivery to the most remote outlet shall be 
determined using the longest run of piping and the 
load of the section. 

2. The pipe size of each section of branch piping not 
previously sized shall be determined using the 
length of piping from the point of delivery to the 
most remote outlet in each branch and the load of the 
section. 

C402.4.3 Hybrid pressure. The pipe size for each section 
of higher pressure gas piping shall be determined using the 
longest length of piping from the point of delivery to the 
most remote line pressure regulator. The pipe size from the 
line pressure regulator to each outlet shall be determined 
using the length of piping from the regulator to the most 
remote outlet served by the regulator. 

C402,5 Allowable pressure drop. The design pressure loss in 
any piping system under maximum probable flow conditions, 
from the point of delivery to the inlet connection of the 
appliance, shall be such that the supply pressure at the appli- 
ance is greater than the minimum pressure required for proper 
appliance operation. 

C402.6 Maximum design operating pressure. The maxi- 
mum design operating pressure for piping systems located 
inside buildings shall not exceed 5 pounds per square inch 
gauge (psig) (34 kPa gauge) except where one or more of the 
following conditions are met: 



1. The piping system is welded. 

2. The piping is located in a ventilated chase or otherwise 
enclosed for protection against accidental gas accumula- 
tion. 

3 . The piping is located inside buildings or separate areas of 
buildings used exclusively for: 

3.1. Industrial processing or heating; 

3.2. Research; 

3.3. Warehousing; or 

3.4. Boiler or mechanical rooms. 

4. The piping is a temporary installation for buildings under 
construction. 

C402.6.1 Liquefied petroleum gas systems. The operating 
pressure for undiluted LP-gas systems shall not exceed 20 
psig (140 kPa gauge). Buildings having systems designed to 
operate below -5°F (-21°C) or with butane or a pro- 
pane-butane mix shall be designed to either accommodate 
liquid LP-gas or prevent LP-gas vapor from condensing into 
a Uquid. 

Exception: Buildings or separate areas of buildings con- 
structed in accordance with Chapter 10 of NFPA 58 and 
used exclusively to house industrial processes, research 
and experimental laboratories, or equipment or process- 
ing having similar hazards. 

C402.6.2 License requirements. LP-gas installers must be 
licensed by the State Fire Marshal in accordance with ORS 
480.432 through 480.436. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.21 



APPENDIX C 



TABLE C402.4(1) 
SCHEDULE 40 METALLIC PIPE 



Gas 


Natural 


Inlet Pressure 


Less than 2 psi 


Pressure Drop 


0.3 in. w.c. 


Specific Gravity 


0.60 



PIPE SIZE (inch) 


Nominal 


% 


\ 


1 


1V4 


l'/2 


2 


2V2 


3 


4 


5 


6 


8 


10 


12 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


5.047 


6.065 


7.981 


10.020 


11.938 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


131 


273 


514 


1,060 


1,580 


3,050 


4,860 


8,580 


17,500 


31,700 


51,300 


105,000 


191,000 


303,000 


20 


90 


188 


353 


726 


1,090 


2,090 


3,340 


5,900 


12,000 


21,800 


35,300 


72,400 


132,000 


208,000 


30 


72 


151 


284 


583 


873 


1,680 


2,680 


4,740 


9,660 


17,500 


28,300 


58,200 


106,000 


167,000 


40 


62 


129 


243 


499 


747 


1,440 


2,290 


4,050 


8,270 


15,000 


24,200 


49,800 


90,400 


143,000 


50 


55 


114 


215 


442 


662 


1,280 


2,030 


3,590 


7,330 


13,300 


21,500 


44,100 


80,100 


127,000 


60 


50 


104 


195 


400 


600 


1,160 


1,840 


3,260 


6,640 


12,000 


19,500 


40,000 


72,600 


115,000 


70 


46 


95 


179 


368 


552 


1,060 


1,690 


3,000 


6,110 


11,100 


17,900 


36,800 


66,800 


106,000 


80 


42 


89 


167 


343 


514 


989 


1,580 


2,790 


5,680 


10,300 


16,700 


34,200 


62,100 


98,400 


90 


40 


83 


157 


322 


482 


928 


1,480 


2,610 


5,330 


9,650 


15,600 


32,100 


58,300 


92,300 


100 


38 


79 


148 


304 


455 


877 


1,400 


2,470 


5,040 


9,110 


14,800 


30,300 


55,100 


87,200 


125 


33 


70 


131 


269 


403 


777 


1,240 


2,190 


4,460 


8,080 


13,100 


26,900 


48,800 


77,300 


150 


30 


63 


119 


244 


366 


704 


1,120 


1,980 


4,050 


7,320 


11,900 


24,300 


44,200 


70,000 


175 


28 


58 


109 


224 


336 


648 


1,030 


1,820 


3,720 


6,730 


10,900 


22,400 


40,700 


64,400 


200 


26 


54 


102 


209 


313 


602 


960 


1,700 


3,460 


6,260 


10,100 


20,800 


37,900 


59,900 


250 


23 


48 


90 


185 


277 


534 


851 


1,500 


3,070 


5,550 


8,990 


18,500 


33,500 


53,100 


300 


21 


43 


82 


168 


251 


484 


771 


1,360 


2,780 


5,030 


8,150 


16,700 


30,400 


48,100 


350 


19 


40 


75 


154 


231 


445 


709 


1,250 


2,560 


4,630 


7,490 


15,400 


28,000 


44,300 


400 


18 


37 


70 


143 


215 


414 


660 


1,170 


2,380 


4,310 


6,970 


14,300 


26,000 


41,200 


450 


17 


35 


66 


135 


202 


389 


619 


1,090 


2,230 


4,040 


6,540 


13,400 


24,400 


38,600 


500 


16 


33 


62 


127 


191 


367 


585 


1,030 


2,110 


3,820 


6,180 


12,700 


23,100 


36,500 


550 


15 


31 


59 


121 


181 


349 


556 


982 


2,000 


3,620 


5,870 


12,100 


21,900 


34,700 


600 


14 


30 


56 


115 


173 


333 


530 


937 


1,910 


3,460 


5,600 


11,500 


20,900 


33,100 


650 


14 


29 


54 


110 


165 


318 


508 


897 


1,830 


3,310 


5,360 


11,000 


20,000 


31,700 


700 


13 


27 


52 


106 


159 


306 


488 


862 


1,760 


3,180 


5,150 


10,600 


19,200 


30,400 


750 


13 


26 


50 


102 


153 


295 


470 


830 


1,690 


3,060 


4,960 


10,200 


18,500 


29,300 


800 


12 


26 


48 


99 


148 


285 


454 


802 


1,640 


2,960 


4,790 


9,840 


17,900 


28,300 


850 


12 


25 


46 


95 


143 


275 


439 


776 


1,580 


2,860 


4,640 


9,530 


17,300 


27,400 


900 


11 


24 


45 


93 


139 


267 


426 


752 


1,530 


2,780 


4,500 


9,240 


16,800 


26,600 


950 


11 


23 


44 


90 


135 


259 


413 


731 


1,490 


2,700 


4,370 


8,970 


16,300 


25,800 


1,000 


11 


23 


43 


87 


131 


252 


402 


711 


1,450 


2,620 


4,250 


8,720 


15,800 


25,100 


1,100 


10 


21 


40 


83 


124 


240 


382 


675 


1,380 


2,490 


4,030 


8,290 


15,100 


23,800 


1,200 


NA 


20 


39 


79 


119 


229 


364 


644 


1,310 


2,380 


3,850 


7,910 


14,400 


22,700 


1,300 


NA 


20 


37 


76 


114 


219 


349 


617 


1,260 


2,280 


3,680 


7,570 


13,700 


21,800 


1,400 


NA 


19 


35 


73 


109 


210 


335 


592 


1,210 


2,190 


3,540 


7,270 


13,200 


20,900 


1,500 


NA 


18 


34 


70 


105 


203 


323 


571 


1,160 


2,110 


3,410 


7,010 


12,700 


20,100 


1,600 


NA 


18 


33 


68 


102 


196 


312 


551 


1,120 


2,030 


3,290 


6,770 


12,300 


19,500 


1,700 


NA 


17 


32 


66 


98 


189 


302 


533 


1,090 


1,970 


3,190 


6,550 


11,900 


18,800 


1,800 


NA 


16 


31 


64 


95 


184 


293 


517 


1,050 


1,910 


3,090 


6,350 


11,500 


18,300 


1,900 


NA 


16 


30 


62 


93 


178 


284 


502 


1,020 


1,850 


3,000 


6,170 


11,200 


17,700 


2,000 


NA 


16 


29 


60 


90 


173 


276 


488 


1,000 


1,800 


2,920 


6,000 


10,900 


17,200 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit|per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Notes: 

1 . NA means a flow of less than lO cfh. 

2. All table entries have been rounded to three significant digits. 



117.22 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 







TABLE C402.4(2) 
SCHEDULE 40 METALLIC PIPE 






Gas 


Natural 




Inlet Pressure 


Less than 2 psi 




Pressure Drop 


O.i 


in. w.c. 








Specific Gravity 


0.60 
































PIPE 


SIZE (inch) 














Nominal 


'/2 


\ 


1 


l'/4 


iV, 


2 


2'/2 


3 


4 


5 


6 


8 


10 


12 


Actual ID 


0.622 


0.824 


1.049 


i.380 


1.610 


2.067 


2.469 


3.068 


4.026 


5.047 


6.065 


7.981 


10.020 


11.938 


Length (ft) 












Capacity 


in Cubic Feet of Gas Per Hour 












10 


172 


360 


678 


1,390 


2,090 


4,020 


6,400 


11,300 


23,100 


41,800 


67,600 


139,000 


252,000 


399,000 


20 


118 


247 


466 


957 


1,430 


2,760 


4,400 


7,780 


15,900 


28,700 


46,500 


95,500 


173,000 


275,000 


30 


95 


199 


374 


768 


1,150 


2,220 


3,530 


6,250 


12,700 


23,000 


37,300 


76,700 


139,000 


220,000 


40 


81 


170 


320 


657 


985 


1,900 


3,020 


5,350 


10,900 


19,700 


31,900 


65,600 


119,000 


189,000 


50 


72 


151 


284 


583 


873 


1,680 


2,680 


4,740 


9,660 


17,500 


28,300 


58,200 


106,000 


167,000 


60 


65 


137 


257 


528 


791 


1,520 


2,430 


4,290 


8,760 


15,800 


25,600 


52,700 


95,700 


152,000 


70 


60 


126 


237 


486 


728 


1,400 


2,230 


3,950 


8,050 


14,600 


23,600 


48,500 


88,100 


139,000 


80 


56 


117 


220 


452 


677 


1,300 


2,080 


3,670 


7,490 


13,600 


22,000 


45,100 


81,900 


130,000 


90 


52 


110 


207 


424 


635 


1,220 


1,950 


3,450 


7,030 


12,700 


20,600 


42,300 


76,900 


122,000 


100 


50 


104 


195 


400 


600 


1,160 


1,840 


3,260 


6,640 


12,000 


19,500 


40,000 


72,600 


1 15,000 


125 


44 


92 


173 


355 


532 


1,020 


1,630 


2,890 


5,890 


10,600 


17,200 


35,400 


64,300 


102,000 


150 


40 


83 


157 


322 


482 


928 


1,480 


2,610 


5,330 


9,650 


15,600 


32,100 


58,300 


92,300 


175 


37 


77 


144 


296 


443 


854 


1,360 


2,410 


4,910 


8,880 


14,400 


29,500 


53,600 


84,900 


200 


34 


71 


134 


,275 


412 


794 


1,270 


2,240 


4,560 


8,260 


13,400 


27,500 


49,900 


79,000 


250 


30 


63 


119 


244 


366 


704 


1,120 


1,980 


4,050 


7,320 


11,900 


24,300 


44,200 


70,000 


300 


27 


57 


108 


221 


331 


638 


1,020 


1,800 


3,670 


6,630 


10,700 


22,100 


40,100 


63,400 


350 


25 


53 


99 


203 


305 


587 


935 


1,650 


3,370 


6,100 


9,880 


20,300 


36,900 


58,400 


400 


23 


49 


92 


189 


283 


546 


870 


1,540 


3,140 


5,680 


9,190 


18,900 


34,300 


54,300 


450 


22 


46 


86 


177 


266 


512 


816 


1,440 


2,940 


5,330 


8,620 


17,700 


32,200 


50,900 


500 


21 


43 


82 


168 


251 


484 


771 


1,360 


2,780 


5,030 


8,150 


16,700 


30,400 


48,100 


550 


20 


41 


78 


159 


239 


459 


732 


1,290 


2,640 


4,780 


7,740 


15,900 


28,900 


45,700 


600 


19 


39 


74 


152 


228 


438 


699 


1,240 


2,520 


4,560 


7,380 


15,200 


27,500 


43,600 


650 


18 


38 


71 


145 


218 


420 


669 


1,180 


2,410 


4,360 


7,070 


14,500 


26,400 


41,800 


700 


17 


36 


68 


140 


209 


403 


643 


1,140 


2,320 


4,190 


6,790 


14,000 


25,300 


40,100 


750 


17 


35 


66 


135 


202 


389 


619 


1,090 


2,230 


4,040 


6,540 


13,400 


24,400 


38,600 


800 


16 


34 


63 


130 


195 


375 


598 


1,060 


2,160 


3,900 


6,320 


13,000 


23,600 


37,300 


850 


16 


33 


61 


126 


189 


363 


579 


1,020 


2,090 


3,780 


6,110 


12,600 


22,800 


36,100 


900 


15 


32 


59 


122 


183 


352 


561 


992 


2,020 


3,660 


5,930 


12,200 


22,100 


35,000 


950 


15 


31 


58 


118 


178 


342 


545 


963 


1,960 


3,550 


5,760 


11,800 


21,500 


34,000 


1,000 


14 


30 


56 


115 


173 


333 


530 


937 


1,910 


3,460 


5,600 


11,500 


20,900 


33,100 


1,100 


14 


28 


53 


109 


164 


316 


503 


890 


1,810 


3,280 


5,320 


10,900 


19,800 


31,400 


1,200 


13 


27 


51 


104 


156 


301 


480 


849 


1,730 


3,130 


5,070 


10,400 


18,900 


30,000 


1,300 


12 


26 


49 


100 


150 


289 


460 


813 


1,660 


3,000 


4,860 


9,980 


18,100 


28,700 


1,400 


12 


25 


47 


96 


144 


277 


442 


781 


1,590 


2,880 


4,670 


9,590 


17,400 


27,600 


1,500 


11 


24 


45 


93 


139 


267 


426 


752 


1,530 


2,780 


4,500 


9,240 


16,800 


26,600 


1,600 


11 


23 


44 


89 


134 


258 


411 


727 


1,480 


2,680 


4,340 


8,920 


16,200 


25,600 


1,700 


11 


22 


42 ■ 


86 


130 


250 


398 


703 


1,430 


2,590 


4,200 


8,630 


15,700 


24,800 


1,800 


10 


22 


41 


84 


126 


242 


386 


682 


1,390 


2,520 


4,070 


8,370 


. 15,200 


24,100 


1,900 


10 


21 


40 


81 


122 


235 


375 


662 


1,350 


2,440 


3,960 


8,130 


14,800 


23,400 


2,000 


NA 


20 


39 


79 


119 


229 


364 


644 


1,310 


2,380 


3,850 


7,910 


14,400 


22,700 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch - 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Notes: 

1 . NA means a flow of less than 1 cfh. 

2. All table entries have been rounded to three significant digits. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.23 



APPENDIX C 



TABLE C402.4(3) 
SCHEDULE 40 METALLIC PIPE 



Gas 


Natural 


Inlet Pressure 


2.0 psi 


Pressure Drop 


1 .0 psi 


Specific Gravity 


0.60 



PIPE SIZE (inch) 


Nominal 


'/2 


^4 


1 


l'/4 


IV2 


2 


2V2 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


1,510 


3,040 


5,560 


11,400 


17,100 


32,900 


52,500 


92,800 


189,000 


20 


1,070 


2,150 


3,930 


8,070 


12,100 


23,300 


37,100 


65,600 


134,000 


30 


869 


1,760 


3,210 


6,590 


9,880 


19,000 


30,300 


53,600 


109,000 


40 


753 


1,520 


2,780 


5,710 


8,550 


16,500 


26,300 


46,400 


94,700 


50 


673 


1,360 


2,490 


5,110 


7,650 


14,700 


23,500 


41,500 


84,700 


60 


615 


1,240 


2,270 


4,660 


6,980 


13,500 


21,400 


37,900 


77,300 


70 


569 


1,150 


2,100 


4,320 


6,470 


12,500 


19,900 


35,100 


71,600 


80 


532 


1,080 


1,970 


4,040 


6,050 


11,700 


18,600 


32,800 


67,000 


90 


502 


1,010 


1,850 


3,810 


5,700 


11,000 


17,500 


30,900 


63,100 


100 


462 


934 


1,710 


3,510 


5,260 


10,100 


16,100 


28,500 


58,200 


125 


414 


836 


1,530 


3,140 


4,700 


9,060 


14,400 


25,500 


52,100 


150 


372 


751 


1,370 


2,820 


4,220 


8,130 


13,000 


22,900 


46,700 


175 


344 


695 


1,270 


2,601 


3,910 


7,530 


12,000 


21,200 


43,300 


200 


318 


642 


1,170 


2,410 


3,610 


6,960 


11,100 


19,600 


40,000 


250 


279 


583 


1,040 


2,140 


3,210 


6,180 


9,850 


17,400 


35,500 


300 


253 


528 


945 


1,940 


2,910 


5,600 


8,920 


15,800 


32,200 


350 


232 


486 


869 


1,790 


2,670 


5,150 


8,210 


14,500 


29,600 


400 


216 


452 


809 


1,660 


2,490 


4,790 


7,640 


13,500 


27,500 


450 


203 


424 


759 


1,560 


2,330 


4,500 


7,170 


12,700 


25,800 


500 


192 


401 


717 


1,470 


2,210 


4,250 


6,770 


12,000 


24,400 


550 


182 


381 


681 


1,400 


2,090 


4,030 


6,430 


11,400 


23,200 


600 


174 


363 


650 


1,330 


2,000 


3,850 


6,130 


10,800 


22,100 


650 


166 


348 


622 


1,280 


1,910 


3,680 


5,870 


10,400 


21,200 


700 


160 


334 


598 


1,230 


1,840 


3,540 


5,640 


9,970 


20,300 


750 


154 


322 


576 


1,180 


1,770 


3,410 


5,440 


9,610 


19,600 


800 


149 


311 


556 


1,140 


1,710 


3,290 


5,250 


9,280 


18,900 


850 


144 


301 


538 


1,100 


1,650 


3,190 


5,080 


8,980 


18,300 


900 


139 


292 


522 


1,070 


1,600 


3,090 


4,930 


8,710 


17,800 


950 


135 


283 


507 


1,040 


1,560 


3,000 


4,780 


8,460 


17,200 


1,000 


132 


275 


493 


1,010 


1,520 


2,920 


4,650 


8,220 


16,800 


1,100 


125 


262 


468 


960 


1,440 


2,770 


4,420 


7,810 


15,900 


1,200 


119 


250 


446 


917 


1,370 


2,640 


4,220 


7,450 


15,200 


1,300 


114 


239 


427 


878 


1,320 


2,530 


4,040 


7,140 


14,600 


1,400 


110 


230 


411 


843 


1,260 


2,430 


3,880 


6,860 


14,000 


1,500 


106 


221 


396 


812 


1,220 


2,340 


3,740 


6,600 


13,500 


1,600 


102 


214 


382 


784 


1,180 


2,260 


3,610 


6,380 


13,000 


1,700 


99 


207 


370 


759 


1,140 


2,190 


3,490 


6,170 


12,600 


1,800 


96 


200 


358 


736 


1,100 


2,120 


3,390 


5,980 


12,200 


1,900 


93 


195 


348 


715 


1,070 


2,060 


3,290 


5,810 


11,900 


2,000 


91 


189 


339 


695 


1,040 


2,010 


3,200 


5,650 


11,500 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1 -inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Note: All table entries have been rounded to three significant digits. 



117.24 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 





TABLE C402.4(4) 
SCHEDULE 40 METALLIC PIP 


E 


Gas 


Natural 




Inlet Pressure 


3.0 psi 




Pressure Drop 


2.0 psi 




Specific Gravity 


0.60 










PIPE SIZE (inch) 


Nominal 


V2 


% 


1 


IV4 


l'/2 


2 


2V2 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2;067 


2.469 


3.068 


4.026 


Length (ft) 






Capacity in Cubic Feet of Gas Per Hour 




10 


2,350 


4,920 


9,270 


19,000 


28,500 


54,900 


87,500 


155,000 


316,000 


20 


1,620 


3,380 


6,370 


13,100 


19,600 


37,700 


60,100 


106,000 


217,000 


30 


1,300 


2,720 


5,110 


10,500 


15,700 


30,300 


48,300 


85,400 


174,000 


40 


1,110 


2,320 


4,380 


8,990 


13,500 


25,900 


41,300 


73,100 


149,000 


50 


985 


2,060 


3,880 


7,970 


11,900 


23,000 


36,600 


64,800 


132,000 


60 


892 


1,870 


3,520 


7,220 


10,800 


20,800 


33,200 


58,700 


120,000 


70 


821 


1,720 


3,230 


6,640 


9,950 


19,200 


30,500 


54,000 


110,000 


80 


764 


1,600 


3,010 


6,180 


9,260 


17,800 


28,400 


50,200 


102,000 


90 


717 


1,500 


2,820 


5,800 


8,680 


16,700 


26,700 


47,100 


96,100 


100 


677 


1,420 


2,670 


5,470 


8,200 


15,800 


25,200 


44,500 


90,800 


125 


600 


1,250 


2,360 


4,850 


7,270 


14,000 


22,300 


39,500 


80,500 


150 


544 


1,140 


2,140 


4,400 


6,590 


12,700 


20,200 


35,700 


72,900 


175 


500 


1,050 


1,970 


4,040 


6,060 


11,700 


18,600 


32,900 


67,100 


200 


465 


973 


1,830 


3,760 


5,640 


10,900 


17,300 


30,600 


62,400 


250 


412 


862 


1,620 


3,330 


5,000 


9,620 


15,300 


27,100 


55,300 


300 


374 


781 


1,470 


3,020 


4,530 


8,720 


13,900 


24,600 


50,100 


350 


344 


719 


1,350 


2,780 


4,170 


8,020 


12,800 


22,600 


46,100 


400 


320 


669 


1,260 


2,590 


3,870 


7,460 


11,900 


21,000 


42,900 


450 


300 


627 


1,180 


2,430 


3,640 


7,000 


11,200 


19,700 


40,200 


500 


283 


593 


1,120 


2,290 


3,430 


6,610 


10,500 


18,600 


38,000 


550 


269 


563 


1,060 


2,180 


3,260 


6,280 


10,000 


17,700 


36,100 


600 


257 


537 


1,010 


2,080 


3,110 


5,990 


9,550 


16,900 


34,400 


650 


246 


514 


969 


1,990 


2,980 


5,740 


9,150 


16,200 


33,000 


700 


236 


494 


931 


1,910 


2,860 


5,510 


8,790 


15,500 


31,700 


750 


228 


476 


897 


1,840 


2,760 


5,310 


8,470 


15,000 


30,500 


800 


220 


460 


866 


1,780 


2,660 


5,130 


8,180 


14,500 


29,500 


850 


213 


445 


838 


1,720 


2,580 


4,960 


7,910 


14,000 


28,500 


900 


206 


431 


812 


1,670 


2,500 


4,810 


7,670 


13,600 


27,700 


950 


200 


419 


789 


1,620 


2,430 


4,670 


7,450 


13,200 


26,900 


1,000 


195 


407 


767 


1,580 


2,360 


4,550 


7,240 


12,800 


26,100 


1,100 


185 


387 


729 


1,500 


2,240 


4,320 


6,890 


12,200 


24,800 


1,200 


177 


369 


695 


1,430 


2,140 


4,120 


6,570 


11,600 


23,700 


1,300 


169 


353 


666 


1,370 


2,050 


3,940 


6,290 


11,100 


22,700 


1,400 


162 


340 


640 


1,310 


1,970 


3,790 


6,040 


10,700 


21,800 


1,500 


156 


327 


616 


1,270 


1,900 


3,650 


5,820 


10,300 


21,000 


1,600 


151 


316 


595 


1,220 


1,830 


3,530 


5,620 


10,000 


20,300 


1,700 


146 


306 


576 


1,180 


1,770 


3,410 


5,440 


9,610 


19,600 


1,800 


142 


296 


558 


1,150 


1,720 


3,310 


5,270 


9,320 


19,000 


1,900 


138 


288 


542 


1,110 


1,670 


3,210 


5,120 


9,050 


18,400 


2,000 


134 


280 


527 


1,080 


1,620 


3,120 


4,980 


8,800 


18,000 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Note: All table entries have been rounded to three significant digits. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.25 



APPENDIX C 





TABLE C402.4(5) 
SCHEDULE 40 METALLIC PIPE 




Gas 


Natural 




Inlet Pressure 


5.0 psi 






Pressure Drop 


3.5 psi 




Specific Gravity 


0.60 










PIPE SIZE (inch) 


Nominal 


'/2 


\ 


1 


1V4 


l'/2 


2 


2'/2 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 






Capacity in 


Cubic Feet of Gas Per Hour 




10 


3,190 


6,430 


11,800 


24,200 


36,200 


69,700 


111,000 


196,000 ^ 


401,000 


20 


2,250 


4,550 


8,320 


17,100 


25,600 


49,300 


78,600 


139,000 


283,000 


30 


1,840 


3,720 


6,790 


14,000 


20,900 


40,300 


64,200 


113,000 


231,000 


40 


1,590 


3,220 


5,880 


12,100 


18,100 


34,900 


55,600 


98,200 


200,000 


50 


1,430 


2,880 


5,260 


10,800 


16,200 


31,200 


49,700 


87,900 


179,000 


60 


1,300 


2,630 


4,800 


9,860 


14,800 


28,500 


45,400 


80,200 


164,000 


70 


1,200 


2,430 


4,450 


9,130 


13,700 


26,400 


42,000 


74,300 


151,000 


80 


1,150 


2,330 


4,260 


8,540 


1 2,800 


24,700 


39,300 


69,500 


142,000 


90 


1,060 


2,150 


3,920 


8,050 


12,100 


23,200 


37,000 


65,500 


134,000 


100 


979 


1,980 


3,620 


7,430 


11,100 


21,400 


34,200 


60,400 


123,000 


125 


876 


1,770 


3,240 


6,640 


9,950 


19,200 


30,600 


54,000 


110,000 


150 


786 


1,590 


2,910 


5,960 


8,940 


17,200 


27,400 


48,500 


98,900 


175 


728 


1,470 


2,690 


5,520 


8,270 


15,900 


25,400 


44,900 


91,600 


200 


673 


1,360 


2,490 


5,100 


7,650 


14,700 


23,500 


41,500 


84,700 


250 


558 


1,170 


2,200 


4,510 


6,760 


13,000 


20,800 


36,700 


74,900 


300 


506 


1,060 


1,990 


4,090 


6,130 


11,800 


18,800 


33,300 


67,800 


350 


465 


973 


1,830 


3,760 


5,640 


10,900 


17,300 


30,600 


62,400 


400 


433 


905 


1,710 


3,500 


5,250 


10,100 


16,100 


28,500 


58,100 


450 


406 


849 


1,600 


3,290 


4,920 


9,480 


15,100 


26,700 


54,500 


500 


384 


802 


1,510 


3,100 


4,650 


8,950 


14,300 


25,200 


51,500 


550 


364 


762 


1,440 


2,950 


4,420 


8,500 


13,600 


24,000 


48,900 


600 


348 


727 


1,370 


2,810 


4,210 


8,110 


12,900 


22,900 


46,600 


650 


333 


696 


1,310 


2,690 


4,030 


7,770 


12,400 


21,900 


44,600 


700 


320 


669 


1,260 


2,590 


3,880 


7,460 


11,900 


21,000 


42,900 


750 


308 


644 


1,210 


2,490 


3,730 


7,190 


11,500 


20,300 


41,300 


800 


298 


622 


1,170 


2,410 


3,610 


6,940 


11,100 


19,600 


39,900 


850 


288 


602 


1,130 


2,330 


3,490 


6,720 


10,700 


18,900 


38,600 


900 


279 


584 


1,100 


2,260 


3,380 


6,520 


10,400 


18,400 


37,400 


950 


271 


567 


1,070 


2,190 


3,290 


6,330 


10,100 


17,800 


36,400 


1,000 


264 


551 


1,040 


2,130 


3,200 


6,150 


9,810 


17,300 


35,400 


1,100 


250 


524 


987 


2,030 


3,030 


5,840 


9,320 


16,500 


33,600 


1,200 


239 


500 


941 


1,930 


2,900 


5,580 


8,890 


15,700 


32,000 


1,300 


229 


478 


901 


1,850 


2,770 


5,340 


8,510 


15,000 


30,700 


1,400 


220 


460 


866 


1,780 


2,660 


5,130 


8,180 


14,500 


29,500 


1,500 


212 


443 


834 


1,710 


2,570 


4,940 


7,880 


13,900 


28,400 


1,600 


205 


428 


806 


1,650 


2,480 


4,770 


7,610 


13,400 


27,400 


1,700 


198 


414 


780 


1,600 


2,400 


4,620 


7,360 


13,000 


26,500 


1,800 


192 


401 


756 


1,550 


2,330 


4,480 


7,140 


12,600 


25,700 


1,900 


186 


390 


734 


1,510 


2,260 


4,350 


6,930 


12,300 


25,000 


2,000 


181 


379 


714 


1,470 


2,200 


4,230 


6,740 


11,900 


24,300 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1 -inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 mVh, 1 degree = 0.01745 rad. 
Note: All table entries have been rounded to three significant digits; 



117.26 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 





TABLE C402.4(6) 

SEMIRIGID Copper tubing 




Gas 


Natural 




Inlet Pressure 


Less than 2 psi 




Pressure Drop 


0.3 in. w.c. 






Specific Gravity 


0.60 










TUBE SIZE (inch) 


Nominal 


K&L 


V4 


% 


'/2 


% 


% 


1 


l'/4 


iV, 


2 


ACR 


% 


V2 


% 


% 


\ 


iVs 


1% 


' 





Outside 


0375 , 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


: 0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


20 


42 


85 


148 


210 


448 


806 


1,270 


• 2,650 


20 


14 


29 


58 


102 


144 


308 


554 


873 


1,820 


30 


11 


23 


47 


82 


116 


247 


445 


701 


1,460 


40 


10 


, 20 


40 


70 


99 


211 


381 


600 


1,250 


50 


NA 


17 


35 


62 


88 


' 187 


337 


532 


1,110 


60 


NA 


16 


32 


56 


79 


170 


306 


482 


1,000 


70 


NA 


14 


29 


52 


73 


156 


281 


443 


924 


80 


NA 


13 


27 


48 


68 


145 


262 


413 


859 


90 


NA 


13 


26 


45 


64 


136 


245 


387 


806 


100 


NA 


12 


24 . 


43 


60 


129 


232 


366 


761 


125 


NA 


11 


22 


38 


53 


114 


206 


324 


675 


150 


NA 


10 


20 


34 


48 


103 


186 


294 


612 


175 


NA 


NA 


18 


31 


45 


95 


171 


270 


563 


200 


NA ■ 


NA 


17 


29 


41 


89 


159 


251 


523 


250 


NA 


NA 


15 


26 


37 


78 


141 


223 


464 


300 


NA 


NA 


13 


23 


' 33 


71 


128 


202 


420 


350 


NA 


NA 


12 


22 


31 


65 


118 


186 


387 


400 


NA 


NA 


11 


20 


28 


61 


110 


173 


360 


450 


NA 


. NA 


11 


19 


27 


57 


103 


162 


338 


500 


NA 


NA 


10 


18 


25 


54 


97 


153 


319 


550 


NA 


NA 


NA 


17 


24 


51 


92 


145 


303 


600 


NA 


NA 


NA 


16 


23 


49 


88 


139 


289 


650 


NA 


NA 


NA 


15 


22 


47 


84 


133 


277 


700 


NA 


. NA 


■ NA 


15 


21 


45 


81 


128 


266 


750 


NA 


NA 


NA 


14 


20 


43 


78 


123 


256 


800 


NA 


NA 


NA 


14 


20 


42 


75 


119 


247 


850 


NA 


NA 


NA 


13 


19 


40 


73 


115 


239 


900 


NA 


NA 


NA 


13 


18 


39 


71 


HI 


232 


950 


NA 


NA 


NA 


13 


18 


38 


69 


108 


225 


1,000 


NA 


NA 


NA 


12 


17 


37 


67 


105 


219 


1,100 


NA 


NA 


NA 


12 


16 


35 


63 


100 


208 


1,200 


NA 


NA 


NA 


11 


16 


34 


60 


95 


199 


1,300 


NA 


NA 


NA 


11 


15 


32 


58 


91 


190 


1,400 


NA 


NA 


NA 


10 


14 


31 


56 


88 


183 


1,500 


NA 


NA 


NA 


NA 


14 


30 


54 


84 


176 


1,600 


NA 


NA 


NA' 


NA 


13 


29 


52 


82 


170 


1,700 


NA 


NA 


NA 


NA 


13 


28 


50 


79 


164 


1,800 


NA 


NA 


NA 


NA 


13 


27 


49 


77 


159 


1,900 


NA 


NA 


NA 


NA 


12 


26 


47 


74 


155 


2,000 


NA 


NA 


NA 


NA 


12 


25 


46 


72 


151 



For SI: 1 inch = 25.4 ram, 1 foot - 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch ^vater column - 0.2488 kPa, 

1 British thermal unit per hour = 0.293 1 W, 1 cubic foot per hour = 0.0283 nifh, 1 degree = 0.01745 rad. 
Notes: 

1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. NA means a flow of less than 10 cfh. 

3. All table entries have been rounded to three significant digits. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.27 



APPENDIX C 





TABLE C402.4(7) 
SEMIRIGID COPPER TUBING 




Gas 


Natural 






Inlet Pressure 


Less than 2 psi 




Pressure Drop 


0.5 in. w.c. 




Specific Gravity 


0.60 












TUBE SIZE (inch) 


Nominal 


K&L 


V4 


% 


Vz 


% 


% 


1 


l'/4 


I'A 


2 


ACR 


'/8 


V2 


% 


% 


\ 


iVs 


iVs 








Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2^125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1:959 


Length (H) 


Capacity in Cubic Feet of Gas Per Hour 


10 


27 


55 


111 


195 


276 


590 


1,060 


1,680 


3,490 


20 


18 


38 


77 


134 


190 


406 


730 


1,150 


2,400 


30 


15 


30 


61 


107 


152 


326 


586 


925 


1,930 


40 


13 


26 


53 


92 


131 


279 


' 502 


791 


1,650 


50 


11 


23 


47 


82 


116 


247 


445 


701 


1,460 


60 


10 


21 


42 


74 


105 


224 


403 


635 


1,320 


70 


NA 


19 


39 


68 


96 


206 


371 


585 


1,220 


80 


NA 


18 


36 


, 63 


90 


192 


345 


544 


1;130 


90 


NA 


17 


34 


59 


84 


180 


324 


510 


1,060 


100 


NA 


16 


32 


56 


79 


170 


306 


482 


1,000 


125 


NA 


14 


28 


50 


70 


151 


271 


427 


890 


150 


NA 


13 


26 


45 


64 


136 


245 


387 


806 


175 


NA 


12 


24 


41 


59 


125 


226 


356 


742 


200 


NA 


11 


22 


39 


55 


117 


210 


331 


690 


250 


NA 


NA 


20 


34 


48 


103 


186 


294 


612 


300 


NA 


NA 


18 


31 


44 


94 


169 


266 


554 


350 


NA 


NA 


16 


28 


40 


86 


155 


245 


510 


400 


NA 


NA 


15 


26 


38 


80 


144 


228 


474 


450 


NA 


NA 


14 


25 


35 


75 


135 


214 


445 


500 


NA 


NA 


13 


23 


33 


71 


128 


202 


420 


550 


NA 


NA 


13 


22 


32 


68 


122 


192 


399 


600 


NA 


NA 


12 


21 


30 


64 


116 


183 


381 


650 


NA 


NA 


12 


20 


29 


62 


111 


175 


365 


700 


NA 


NA 


11 


20 


28 


59 


107 


168 


350 


750 


NA 


NA 


11 


19 


27 


57 


103 


162 


338 


800 


NA 


NA 


10 


18 


26 


55 


99 


156 


326 


850 


NA 


NA 


10 


18 


25 


53 


96 


151 


315 


900 


NA 


NA 


NA 


17 


24 


52 


93 


147 


306 


950 


NA 


NA 


NA 


17 


24 


50 


90 


143 


297 


1,000 


NA 


NA 


NA 


16 


23 


49 


88 


139 


289 


1,100 


NA 


NA 


NA 


15 


22 


46 


84 


132 


274 


1,200 


NA 


NA 


NA 


15 


21 


44 


80 


126 


262 


1,300 


NA 


NA 


NA 


14 


20 


42 


76 


120 


251 


1,400 


NA 


NA 


NA 


13 


19 


41 


73 


116 


241 


1,500 


NA 


NA 


NA 


13 


18 


39 


71 


111 


232 


1,600 


NA 


NA 


NA 


13 


18 


38 


68 


108 


224 


1,700 


NA 


NA 


NA 


12 


17 


37 


66 


104 


217 


1,800 


NA 


NA 


NA 


12 


17 


36 


64 


101 


210 


1,900 


NA 


NA 


NA 


11 


16 


35 


62 


98 


204 


2,000 


NA 


NA 


NA 


11 


16 


34 


60 


95 


199 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch - 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 mVh, 1 degree = 0.01745 rad. 
Notes: 

1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. NA means a flow of less than 10 cfh. 

3. All table entries have been rounded to three significant digits. 



117.28 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 





Gas 


Natural 


TABLE C402.4(8) 
SEMIRIGID COPPER TUBING 


inlet Pressure 


Less than 2 psi 


Pressure Drop 


1.0 in. w.c. 




Specific Gravity 


0.60 






TUBE SIZE (inch) 


Nominal 


K&L 


'/4 


^/8 


'/2 


% 


% 


1 


l'/4 


I'll 


2 




ACR 


% 


'/2 


% 


'U 


Vs 


I'/s 


1% 


— 


— 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


39 


80 


162 


283 


402 


859 


1,550 


2,440 


5,080 


20 


27 


55 


111 


195 


276 


590 


1,060 


1,680 


3,490 


30 


21 


44 


89 


156 


222 


474 


853 


1,350 


2,800 


40 


18 


38 


77 


134 


190 


406 


730 


1,150 


2,400 


50 


16 


33 


68 


119 


168 


359 


647 


1,020 


2,130 


60 


15 


30 


61 


107 


152 


326 


586 


925 


1,930 


70 


13 


28 


57 


99 


140 


300 


539 


851 


1,770 


80 


13 


26 


53 


92 


131 


279 


502 


791 


1,650 


90 


12 


24 


49 


86 


122 


262 


471 


742 


1,550 


100 


11 


23 


47 


82 


116 


247 


445 


701 


1,460 


125 


NA 


20 


41 


72 


103 


219 


394 


622 


1,290 


150 


NA 


18 


37 


65 


93 


198 


357 


563 


1,170 


175 


NA 


17 


34 


60 


85 


183 


329 


518 


1,080 


200 


NA 


16 


32 


56 


79 


170 


306 


482 


1,000 


250 


NA 


14 


28 


50 


70 


151 


271 


427 


890 


300 


NA 


13 


26 


45 


64 


136 


245 


387 


806 


350 


NA 


12 


24 


41 


59 


125 


226 


356 


742 


400 


NA 


11 


22 


39 


55 


117 


210 


331 


690 


450 


NA 


10 


21 


36 


51 


110 


197 


311 


647 


500 


NA 


NA 


20 


34 


48 


103 


186 


294 


612 


550 


NA 


NA 


19 


32 


46 


98 


177 


279 


581 


600 


NA 


NA 


18 


31 


44 


94 


169 


266 


554 


650 


NA 


NA 


17 


30 


42 


90 


162 


255 


531 


700 


NA 


NA 


16 


28 


40 


86 


155 


245 


510 


750 


NA 


NA 


16 


27 


39 


83 


150 


236 


491 


800 


NA 


NA 


15 


26 


38 


80 


144 


228 


474 


850 


NA 


NA 


15 


26 


36 


78 


140 


220 


459 


900 


NA 


NA 


14 


25 


35 


75 


135 


214 


445 


950 


NA 


NA 


14 


24 


34 


73 


132 


207 


432 


1,000 


NA 


NA 


13 


23 


33 


71 


128 


202 


420 


1,100 


NA 


NA 


13 


22 


32 


68 


122 


192 


399 


1,200 


NA 


NA 


12 


21 


30 


64 


116 


183 


381 


1,300 


NA 


NA 


12 


20 


29 


62 


111 


175 


365 


1,400 


NA 


NA 


11 


20 


28 


59 


107 


168 


350 


1,500 


NA 


NA 


11 


19 


27 


57 


103 


162 


338 


1,600 


NA 


NA 


10 


18 


26 


55 


99 


156 


326 


1,700 


NA 


NA 


10 


18 


25 


53 


96 


151 


315 


1,800 


NA 


NA 


NA 


17 


24 


52 


93 


147 


306 


1,900 


NA 


NA 


NA 


17 


24 


50 


90 


143 


297 


2,000 


NA 


NA 


NA 


16 


23 


49 


88 


139 


289 



For SL 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch - 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Notes: 

1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. NA means a flow of less than 10 cfh. 

3. All table entries have been rounded to three significant digits. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.29 



APPENDIX C 





TABLE C402.4(9) 
SEMIRIGID COPPER TUBING 




Gas 


Natural 




Inlet Pressure 


Less than 2.0 psi 




Pressure Drop 


17.0in w.c. 




Specific Gravity 


0.60 










TUBE SIZE (inch) 


Nominal 


K&L 


V4 


\ 


'/2 


^/8 


■% 


1 


1V4 


l'/2 


2 


ACR 


\ 


V2 


% 


% 


Vs 


iVs 


1^8 








Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas Per IHour 


10 


190 


391 


796 


1,390 


1,970 


4,220 


7,590 


12,000 


24,900 


20 


130 


269 


547 


956 


1,360 


2,900 


5,220 


8,230 


17,100 


30 


105 


216 


439 


768 


1,090 


2,330 


4,190 


6,610 


13,800 


40 


90 


185 


376 


657 


932 


1,990 


3,590 


5,650 


11,800 


50 


79 


164 


333 


582 


826 


1,770 


3,180 


5,010 


10,400 


60 


72 


148 


302 


528 


749 


1,600 


2,880 


4,540 


9,460 


70 


66 


137 


278 


486 


689 


1,470 


2,650 


4,180 


8,700 


80 


62 


127 


258 


452 


641 


1,370 


2,460 


3,890 


8,090 


90 


58 


119 


243 


424 


601 


1,280 


2,310 


3,650 


7,590 


100 


55 


113 


229 


400 


568 


1,210 


2,180 


3,440 


7,170 


125 


48 


100 


203 


355 


503 


1,080 


1,940 


3,050 


6,360 


150 


44 


90 


184 


321 


456 


974 


1,750 


2,770 


5,760 


175 


40 


83 


169 


296 


420 


896 


1,610 


2,540 


5,300 


200 


38 


77 


157 


275 


390 


834 


1,500 


2,370 


4,930 - 


250 


33 


69 


140 


244 


346 


739 


1,330 


2,100 


4,370 


300 


30 


62 


126 


221 


313 


670 


1,210 


1,900 


3,960 


350 


28 


57 


116 


203 


288 


616 


1,110 


1,750 


3,640 


400 


26 


53 


108 


189 


268 


573 


1,030 


1,630 


3,390 


450 


24 


50 


102 


177 


252 


538 


968 


1,530 


3,180 


500 


23 


47 


96 


168 


238 


508 


914 


1,440 


3,000 


550 


22 


45 


91 


159 


226 


482 


868 


1,370 


2,850 


600 


21 


43 


87 


152 


215 


460 


829 


1,310 


2,720 


650 


20 


41 


83 


145 


206 


441 


793 


1,250 


2,610 


700 


19 


39 


80 


140 


198 


423 


762 


1,200 


2,500 


750 


18 


38 


77 


135 


191 


408 


734 


1,160 


2,410 


800 


18 


37 


74 


130 


184 


394 


709 


1,120 


2,330 


850 


17 


35 


72 


126 


178 


381 


686 


1,080 


2,250 


900 


17 


34 


70 


122 


173 


370 


665 


1,050 


2,180 


950 


16 


33 


68 


118 


168 


359 


646 


1,020 


2,120 


1,000 


16 


32 


66 


115 


163 


349 


628 


991 


2,060 


1,100 


15 


31 


63 


109 


155 


332 


597 


941 


1,960 


1,200 


14 


29 


60 


104 


148 


316 


569 


898 


1,870 


1,300 


14 


28 


57 


100 


142 


303 


545 


860 


1,790 


1,400 


13 


27 


55 


96 


136 


291 


524 


826 


1,720 


1,500 


13 


26 


53 


93 


131 


280 


505 


796 


1,660 


1,600 


12 


25 


51 


89 


127 


271 


487 


768 


1,600 


1,700 


12 


24 


49 


86 


123 


262 


472 


744 


1,550 


1,800 


11 


24 


48 


84 


119 


254 


457 


721 


1,500 


1,900 


11 


23 


47 


81 


115 


247 


444 


700 


1,460 


2,000 


11 


22 


45 


79 


112 


240 


432 


681 


1,420 



For SI: 1 inch - 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column - 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Notes: 

1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. All table entries have been rounded to three significant digits. 



117.30 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 





TABLE C402.4(10) 
SEMIRIGID COPPER TUBING 




Gas 


Natural 




Inlet Pressure 


2.0 psi 




Pressure Drop 


1.0 psi 




Specific Gravity 


0.60 










TUBE SIZE (inch) 


Nominal 


K&L 


'/4 


^/8 


'/2 


=/8 


'u 


1 


l'/4 


V/2 


2 




ACR 


Vs 


'/2 


'/8 


'U 


\ 


iVs 


1% 








Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


245 


506 


1,030 


1,800 


2,550 


5,450 


9,820 


15,500 


32,200 


20 


169 


348 


708 


1,240 


1,760 


3,750 


6,750 


10,600 


22,200 


30 


135 


279 


568 


993 


1,410 


3,010 


5,420 


8,550 


17,800 


40 


116 


239 


486 


850 


1,210 


2,580 


4,640 


7,310 


15,200 


50 


103 


212 


431 


754 


1,070 


2,280 


4,110 


6,480 


13,500 


60 


93 


192 


391 


683 


969 


2,070 


3,730 


5,870 


12,200 


70 


86 


177 


359 


628 


891 


1,900 


3,430 


5,400 


11,300 


80 


80 


164 


334 


584 


829 


1,770 


3,190 


5,030 


10,500 


90 


75 


154 


314 


548 


778 


1,660 


2,990 


4,720 


9,820 


100 


71 


146 


296 


518 


735 


1,570 


2,830 


4,450 


9,280 


125 


63 


129 


263 


459 


651 


1,390 


2,500 


3,950 


8,220 


150 


57 


117 


238 


416 


590 


1,260 


2,270 


3,580 


7,450 


175 


52 


108 


219 


383 


543 


1,160 


2,090 


3,290 


6,850 


200 


49 


100 


204 


356 


505 


1,080 


1,940 


3,060 


6,380 


250 


43 


89 


181 


315 


448 


956 


1,720 


2,710 


5,650 


300 


39 . 


80 


164 


286 


406 


866 


1,560 


2,460 


5,120 


350 


36 


74 


150 


263 


373 


797 


1,430 


2,260 


4,710 


400 


33 


69 


140 


245 


347 


741 


1,330 


2,100 


4,380 


450 


31 


65 


131 


230 


326 


696 


1,250 


1,970 


4,110 


500 


30 


61 


124 


217 


308 


657 


1,180 


1,870 


3,880 


550 


28 


58 


118 


206 


292 


624 


1,120 


1,770 


3,690 


600 


27 


55 


112 


196 


279 • 


595 


1,070 


1,690 


3,520 


650 


26 


53 


108 


188 


267 


570 


1,030 


1,620 


3,370 


700 


25 


51 


103 


181 


256 


548 


986 


1,550 


3,240 


750 


24 


49 


100 


174 


247 


528 


950 


1,500 


3,120 


800 


23 


47 


96 


168 


239 


510 


917 


1,450 


3,010 


850 


22 


46 


93 


163 


231 


493 


888 


1,400 


. 2,920 


900 


22 


44 


90 


158 


224 


478 


861 


1,360 


2,830 


950 


21 


43 


88 


153 


217 


464 


836 


1,320 


2,740 


1,000 


20 


42 


85 


149 


211 


452 


813 


1,280 


2,670 


1,100 


19 


40 


81 


142 


201 


429 


772 


1,220 


2,540 


1,200 


18 


38 


77 


135 


192 


409 


737 


1,160 


2,420 


1,300 


18 


36 


74 


129 


183 


392 


705 


1,110 


2,320 


1,400 


17 


35 


71 


124 


176 


376 


678 


1,070 


2,230 


1,500 


16 


34 


68 


120 


170 


363 


653 


1,030 


2,140 


1,600 


16 


33 


66 


116 


164 


350 


630 


994 


2,070 


1,700 


15 


31 


64 


112 


159 


339 


610 


962 


2,000 


1,800 


15 


30 


62 


108 


154 


329 


592 


933 


1,940 


1,900 


14 


30 


60 


105 


149 


319 


575 


906 


1,890 


2,000 


14 


29 


59 


102 


145 


310 


559 


881 


1,830 



For SI: 



Notes: 



1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 
1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 



1 . Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. All table entries have been rounded to three significant digits. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.31 



APPENDIX C 





Gas 


Natural 


TABLE C402.4(11) 
SEMIRIGID COPPER TUBING 


Inlet Pressure 


2.0 psi 


Pressure Drop 


1.5 psi 




Specific Gravity 


0.60 






SPECIAL 
USE 


Pipe sizing between point of delivery and the house line regulator. Total load supplied by a single house line regulator not exceeding 150 
cubic feet per hour. 


TUBE SIZE (inch) 


Nominal 


K&L 


'/4 


% 


'/2 


^/8 


'u 


1 


l'/4 


IV2 


2 




ACR 


% 


'/2 


^/8 


V4 


\ 


I'/s 


1% 








Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


303 


625 


1,270 


2.220 


3,150 


6,740 


12,100 


19,100 


39,800 


20 


208 


430 


874 


1,530 


2,170 


4,630 


8,330 


13,100 


27,400 


30 


167 


345 


702 


1,230 


1,740 


3,720 


6,690 


10,600 


22,000 


40 


143 


295 


601 


1,050 


1,490 


3,180 


5,730 


9,030 


18,800 


50 


127 


262 


532 


931 


1,320 


2,820 


5,080 


8,000 


16,700 


60 


115 


237 


482 


843 


1,200 


2,560 


4,600 


7,250 


15,100 


70 


106 


218 


444 


776 


1,100 


2,350 


4,230 


6,670 


13,900 


80 


98 


203 


413 


722 


1,020 


2,190 


3,940 


6,210 


12,900 


90 


92 


190 


387 


677 


961 


2,050 


3,690 


5,820 


12,100 


100 


87 


180 


366 


640 


907 


1,940 


3,490 


5,500 


1 1,500 


125 


77 


159 


324 


567 


804 


1,720 


3,090 


4,880 


10,200 


150 


70 


144 


294 


514 


729 


1,560 


2,800 


4,420 


9,200 


175 


64 


133 


270 


472 


670 


1,430 


. 2,580 


4,060 


8,460 


200 


60 


124 


252 


440 


624 


1,330 


2,400 


3,780 


7,870 


250 


53 


110 


223 


390 


553 


1,180 


2,130 


3,350 


6,980 


300 


48 


99 


202 


353 


501 


1,070 


1,930 


3,040 


6,320 


350 


44 


91 


186 


325 


461 


984 


1,770 


2,790 


- 5,820 


400 


41 


85 


173 


302 


429 


916 


1,650 


2,600 


5,410 


450 


39 


80 


162 


283 


402 


859 


1,550 


2,440 


5,080 


500 


36 


75 


153 


268 


380 


811 


1,460 


2,300 


4,800 


550 


35 


72 


146 


254 


361 


771 


1,390 


2,190 


4,560 


600 


33 


68 


139 


243 


344 


735 


1,320 


2,090 


4,350 


650 


32 


65 


133 


232 


330 


704 


1,270 


2,000 


4,160 


700 


30 


63 


128 


223 


317 


676 


1,220 


1,920 


4,000 


750 


29 


60 


123 


215 


305 


652 


1,170 


1,850 


3,850 


800 


28 


58 


119 


208 


295 


629 


1,130 


1,790 


3,720 


850 


27 


57 


115 


201 


285 


609 


1,100 


1,730 


3,600 


900 


27 


55 


111 


195 


276 


590 


1,060 


1,680 


3,490 


950 


26 


53 


108 


189 


268 


573 


1,030 


1,630 


3,390 


1,000 


25 


52 


105 


184 


261. 


558 


1,000 


1,580 


3,300 


1,100 


24 


49 


100 


175 


248 


530 


954 


1,500 


3,130 


1,200 


23 


47 


95 


167 


237 


505 


910 


1,430 


2,990 


1,300 


22 


45 


91 


160 


227 


484 


871 


1,370 


2,860 


1,400 


21 


43 


88 


153 


218 


465 


837 


1,320 


2,750 


1,500 


20 


42 


85 


148 


210 


448 


806 


1,270 


2,650 


1,600 


19 


40 


82 


143 


202 


432 


779 


1,230 


2,560 


1,700 


19 


39 


79 


138 


196 


419 


753 


1,190 


2,470 


1,800 


18 


38 


77 


134 


190 


406 


731 


1,150 


2,400 


1,900 


18 


37 


74 


130 


184 


394 


709 


1,120 


2,330 


2,000 


17 


36 


72 


126 


179 


383 


690 


1,090 


2,270 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.293 1 W, 1 cubic foot per hour = 0.0283 ni/h, 1 degree = 0.01745 rad. 
Notes: 

1 . Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. Where this table is used to size the tubing upstream of a line pressure regulator, the pipe or tubing downstream of the line pressure regulator shall be sized using a pressure drop not greater 
than 1 inch w.c. 

3. All table entries have been rounded to three significant digits. 



117.32 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 





Gas 


Natural 


TABLE C402.4(12) 
SEMIRIGID COPPER TUBING 


Inlet Pressure 


5.0 psi 


Pressure Drop 


3.5 psi 




Specific Gravity 


0.60 






TUBE SIZE (inch) 


Nominal 


K&L 


V4 


% 


'/2 


% 


% 


1 


IV4 


I'll 


2 


ACR 


'h 


^ V2 


% 


'U 


'k 


iVs 


1^/8 








Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


511 


1,050 


2,140 


3,750 


5,320 


11,400 


20,400 


32,200 


67,100 


20 


351 


724 


1,470 


2,580 


3,650 


7,800 


14,000 


22,200 


46,100 


30 


282 


582 


1,180 


2,070 


2,930 


6,270 


11,300 


17,800 


37,000 


40 


241 


498 


1,010 


1,770 


2,510 


5,360 


9,660 


15,200 


31,700 


50 


214 


441 


898 


1,570 


2,230 


4,750 


8,560 


13,500 


28,100 


60 


194 


400 


813 


1,420 


2,020 


4,310 


7,750 


12,200 


25,500 


70 


178 


368 


748 


1,310 


1,860 


3,960 


7,130 


11,200 


23,400 


80 


166 


342 


696 


1,220 


1,730 


3,690 


6,640 


10,500 


21,800 


90 


156 


321 


653 


1,140 


1,620 


3,460 


6,230 


9,820 


20,400 


100 


147 


303 


617 


1,080 


1,530 


3,270 


5,880 


9,270 


19,300 


125 


130 


269 


547 


955 


1,360 


2,900 


5,210 


8,220 


17,100 


150 


118 


243 


495 


866 


1,230 


2,620 


4,720 


7,450 


15,500 


175 


109 


224 


456 


796 


1,130 


2,410 


4,350 


6,850 


14,300 


200 


101 


208 


424 


741 


1,050 


2,250 


4,040 


6,370 


13,300 


250 


90 


185 


376 


657 


932 


1,990 


3,580 


5,650 


11,800 


300 


81 


167 


340 


595 


844 


1,800 


3,250 


5,120 


10,700 


350 


75 


154 


313 


547 


777 


1,660 


2,990 


4,710 


9,810 


400 


69 


143 


291 


509 


722 


1,540 


2,780 


4,380 


9,120 


450 


65 


134 


273 


478 


678 


1,450 


2,610 


4,110 


8,560 


500 


62 


127 


258 


451 


640 


1,370 


2,460 


3,880 


8,090 


550 


58 


121 


245 


429 


608 


1,300 


2,340 


3,690 


7,680 


600 


56 


115 


234 


409 


580 


1,240 


2,230 


3,520 


7,330 


650 


53 


110 


224 


392 


556 


1,190 


2,140 


3,370 


7,020 


700 


51 


106 


215 


376 


534 


1,140 


2,050 


3,240 


6,740 


750 


49 


102 


207 


362 


514 


1,100 


1,980 


3,120 


6,490 


800 


48 


98 


200 


350 


497 


1,060 


1,910 


3,010 


6,270 


850 


46 


95 


194 


339 


481 


1,030 


1,850 


2,910 


6,070 


900 


45 


92 


188 


328 


466 


1,000 


1,790 


2,820 


5,880 


950 


L 43 


90 


182 


319 


452 


967 


1,740 


2,740 


5,710 


1,000 


42 


87 


177 


310 


440 


940 


1,690 


2,670 


5,560 


1,100 


40 


83 


169 


295 


418 


893 


1,610 


2,530 


5,280 


1,200 


38 


79 


161 


281 


399 


852 


1,530 


2,420 


5,040 


1,300 


37 


76 


154 


269 


382 


816 


1,470 


2,320 


4,820 


1,400 


35 


73 


148 


259 


367 


784 


1,410 


2,220 


4,630 


1,500 


34 


70 


143 


249 


353 


755 


1,360 


2,140 


4,460 


1,600 


33 


68 


138 


241 


341 


729 


1,310 


2,070 


4,310 


1,700 


32 


65 


133 


233 


330 


705 


1,270 


2,000 


4,170 


1,800 


31 


63 


129 


226 


320 


684 


1,230 


1,940 


4,040 


1,900 


30 


62 


125 


219 


311 


664 


1,200 


1,890 


3,930 


2,000 


29 


60 


122 


213 


302 


646 


1,160 


1,830 


3,820 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour - 0.0283 ralh, 1 degree = 0.01745 rad. 
Notes: 

1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. All table entries have been rounded to three significant digits. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.33 



APPENDIX C 





Gas r 


"Jatural 


TABLEC402.4(13) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure I 


.ess than 2 psi 


Pressure Drop 0.5 in. w.c. 




Specific Gravity 0.60 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


5 


46 


63 


115 


134 


225 


270 


471 


546 


895 


1,790 


2,070 


3,660 


4,140 


10 


32 


44 


82 


95 


161 


192 


330 


383 


639 


1,260 


1,470 


2,600 


2,930 


15 


25 


35 


66 


77 


132 


157 


267 


310 


524 


1,030 


1,200 


2,140 


2,400 


20 


22 


31 


58 


67 


116 


137 


231 


269 


456 


888 


1,050 


1,850 


2,080 


25 


19 


27 


52 


60 


104 


122 


206 


240 


409 


793 


936 


1,660 


1,860 


30 


18 


25 


47 


55 


96 


112 


188 


218 


374 


723 


856 


1,520 


1,700 


40 


15 


21 


41 


47 


83 


97 


162 


188 


325 


625 


742 


1,320 


1,470 


50 


13 


19 


37 


42 


75 


87 


144 


168 


292 


559 


665 


1,180 


1,320 


60 


12 


17 


34 


38 


68 


80 


131 


153 


267 


509 


608 


1,080 


1,200 


70 


11 


16 


31 


36 


63 


74 


121 


141 


248 


471 


563 


1,000 


1,110 


80 


10 


15 


^29 


33 


60 


69 


113 


132 


232 


440 


527 


940 


1,040 


90 


10 


14 


28 


32 


57 


65 


107 


125 


219 


415 


498 


887 


983 


100 


9 


13 


26 


30 


54 


62 


101 


.118 


208 


393 


472 


843 


933 


150 


7 


10 


20 


23 


42 


48 


78 


91 


171 


320 


387 


691 


762 


200 


6 


9 


18 


21 


38 


44 


71 


82 


148 


277 


336 


600 


661 


250 


5 


8 


16 


19 


34 


39 


63 


74 


133 


247 


301 


538 


591 


300 


5 


7 


15 


17 


32 


36 


57 


67 


95 


226 


275 


492 


540 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895]<:Pa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m^/h, 1 degree = 0.01745 rad. 
Notes: 

1 . Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L - 1.3n, where L is additional length (feet) of tubing and« is the number of additional fittings and/or bends. 

2. EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

3. All table entries have been rounded to three significant digits. 



117.34 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 





Gas Natural 


TABLE 6402.4(14) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure Less than 2 psi 


Pressure Drop 3.0 in. w.c. 


. 


Specific Gravity 0.60 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 60 


62 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


5 


120 


160 


277 


327 


529 


649 


1,180 


1,370 


2,140 


4,430 


5,010 


8,800 


10,100 


10 


83 


112 


197 


231 


380 


462 


828 


958 


1,530 


3,200 


3,560 


6,270 


7,160 


15 


67 


90 


161 


189 


313 


379 


673 


778 


1,250 


2,540 


2,910 


5,140 


5,850 


20 


57 


78 


140 


164 


273 


329 


580 


672 


1,090 


2,200 


2,530 


4,460 


5,070 


25 


51 


69 


125 


147 


245 


295 


518 


599 


978 


1,960 


2,270 


4,000 


4,540 


30 


46 


63 


115 


134 


225 , 


270 


471 


546 


895 


1,790 


2,070 


3,660 


4,140 


40 


39 


54 


100 


116 


196 


234 


407 


471 


778 


1,550 


1,800 


3,180 


3,590 


50 


35 


48 


89 


104 


176 


210 


363 


421 


698 


1,380 


1,610 


2,850 


3,210 


60 


32 


44 


82 


95 


161 


192 


330 


383 


639 


1,260 


1,470 


2,600 


2,930 


70 


29 


41 


76 


88 


150 


178 


306 


355 


593 


1,170 


1,360 


2,420 


2,720 


80 


27 


38 


71 


82 


141 


167 


285 


331 


555 


1,090 


1,280 


2,260 


2,540 


90 


26 


36 


67 


77 


133 


157 


268 


311 


524 


1,030 


1,200 


2,140 


2,400 


100 


24 


34 


63 


73 


126 


149 


254 


295 


498 


974 


1,140 


2,030 


2,280 


150 


19 


27 


52 


60 


104 


122 


206 


240 


409 


793 


936 


1,660 


1,860 


200 


17 


23 


45 


52 


91 


106 


178 


207 ^ 


355 ^ 


686 


812 


1,440 


1,610 


250 


15 


21 


40 


46 


82 


95 


159 


184 


319 


613 


728 


1,290 


1,440 


300 


13 


19 


37 


42 


75 


87 


144 


168 


234 


559 


665 


1,180 


1,320 



For SI: 1 inch - 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m%, 1 degree = 0.01745 rad. 
Notes: 

1 . Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L = 1 .3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends. 

2. EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

3. All table entries have been rounded to three significant digits. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.35 



APPENDIX C 





Gas 1 


Natural 


TABLEC402.4(15) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure L 


.ess than 2 psi 


Pressure Drop ( 


3.0 in. w.c. 




Specific Gravity 0.60 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity In Cubic Feet of Gas Per Hour 


5 


173 


229 


389 


461 


737 


911 


1,690 


1,950 


3,000 


6,280 


7,050 


12,400 


14,260 


10 


120 


160 


277 


327 


529 


649 


1,180 


1,370 


2,140 


4,430 


5,010 


8,800 


10,100 


15 


96 


130 


227 


267 


436 


532 


960 


1,110 


1,760 


3,610 


4,100 


7,210 


8,260 


20 


83 


112 


197 


231 


380 


462 


828 


958 


1,530 


3,120 


3,560 


6,270 


7,160 


25 


74 


99 


176 


207 


342 


414 


739 


855 


1,370 


2,790 


3,190 


5,620 


6,400 


30 


67 


90 


161 


189 


313 


379 


673 


778 


1,250 


2,540 


2,910 


5,140 


5,850 


40 


57 


78 


140 


164 


273 


329 


580 


672 


1,090 J 


2,200 


2,530 


4,460 


5,070 


50 


51 


69 


125 


147 


245 


295 


518 


599 


978 


1,960 


2,270 


4,000 


4,540 


60 


46 


63 


115 


134 


225 


270 


471 


546 


895 


1,790 


2,070 


3,660 


4,140 


70 


42 


58 


106 


124 


209 


250 


435 


505 


830 


1,660 


1,920 


3,390 


3,840 


80 


39 


54 


100 


116 


196 


234 


407 


471 


778 


1,550 


1,800 


3,180 


3,590 


90 


37 


51 


94 


109- 


185 


221 


383 


444 


735 


1,460 


1,700 


3,000 


3,390 


100 


35 


48 


89 


104 


176 


210 


363 


421 


698 


1,380 


1,610 


2,850 


3,210 


150 


28 


39 


73 


85 


145 


172 


294 


342 


573 


1,130 


1,320 


2,340 


2,630 


200 


24 


34 


63 


73 


126 


149 


254 


295 


498 


974 


1,140 


2,030 


2,280 


250 


21 


30 


57 


66 


114 


134 


226 


263 


447 


870 


1,020 


1,820 


2,040 


300 


19 


27 


52 


60 


104 


122 


206 


240 


409 


793 


936 


1,660 


1,860 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m^/h, 1 degree = 0.01745 rad. 
Notes: 

1 . Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends. 

2. EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

3. All table entries have been rounded to three significant digits. 



117.36 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 





Gas r 


Natural 


TABLEC402.4(16) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure 'c 


?.0 psi 


Pressure Drop 1 


.Opsi 




Specific Gravity ( 


).60 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity In Cubic Feet of Gas Per Hour 


10 


270 


353 


587 


700 


1,100 


1,370 


2,590 


2,990 


4,510 


9,600 


10,700 


18,600 


21,600 


25 


166 


220 


374 


444 


709 


876 


1,620 


1,870 


2,890 


6,040 


6,780 


11,900 


13,700 


30 


151 


200 


342 


405 


650 


801 


1,480 


1,700 


2,640 


5,510 


6,200 


10,900 


12,500 


40 


129 


172 


297 


351 


567 


696 


1,270 


1,470 


2,300 


4,760 


5,380 


9,440 


10,900 


50 


115 


154 


266 


314 


510 


624 


1,140 


1,310 


2,060 


4,260 


4,820 


8,470 


9,720 


75 


93 


124 


218 


257 


420 


512 


922 


1,070 


1,690 


3,470 


3,950 


6,940 


7,940 


80 


89 


120 


211 


249 


407 


496 


892 


1,030 


1,640 


3,360 


3,820 


6,730 


7,690 


100 


79 


107 


189 


222 


366 


445 


795 


920 


1,470 


3,000 


3,420 


6,030 


6,880 


150 


64 


87 


155 


182 


302 


364 


646 


748 


1,210 


2,440 


2,800 


4,940 


5,620 


200 


55 


75 


135 


157 


263 


317 


557 


645 


1,050 


2,110 


2,430 


4,290 


4,870 


250 


49 


67 


121 


141 


236 


284 


497 


576 


941 


1,890 


2,180 


3,850 


4,360 


300 


44 


61 


110 


129 


217 


260 


453 


525 


862 


1,720 


1,990 


3,520 


3,980 


400 


38 


52 


96 


111 


189 


225 


390 


453 


749 


1,490 


1,730 


3,060 


3,450 


500 


34 


46 


86 


100 


170 


202 


348 


404 


552 


1,330 


1,550 


2,740 


3,090 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8' mm, 1 pound per square inch = 6.895kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m%, 1 degree = 0.01745 rad. 
Notes: 

1 . Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds ^1^^ psi, DO NOT USE THIS TABLE. Consult with the regula- 
tor manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate. 

2. CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guid- 
ance. 

3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L = l.Bn where L is additional length (feet) of tubing and « is the number of additional fittings and/or bends. 

4. EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

5. All table entries have been rounded to three significant digits. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.37 



APPENDIX C 





Gas 


^Jatural 


TABLE C402.4(17) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure J 


5.0 psi 


Pressure Drop C 


}.5 psi 




Specific Gravity ( 


).60 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


523 


674 


1,080 


1,300 


2,000 


2,530 


4,920 


5,660 


8,300 


18,100 


19,800 


34,400 


40,400 


25 


322 


420 


691 


827 


1,290 


1,620 


3,080 


3,540 


5,310 


11,400 


12,600 


22,000 


25,600 


30 


292 


382 


632 


755 


1,180 


1,480 


2,800 


3,230 


4,860 


10,400 


11,500 


20,100 


23,400 


40 


251 


329 


549 


654 


1,030 


1,280 


2,420 


2,790 


4,230 


8,970 


10,000 


17,400 


20,200 


50 


223 


293 


492 


586 


926 


1,150 


2,160 


2,490 


3,790 


8,020 


8,930 


15,600 


18,100 


75 


180 


238 


403 


479 


763 


944 


1,750 


2,020 


3,110 


6,530 


7,320 


12,800 


14,800 


80 


174 


230 


391 


463 


740 


915 


1,690 


1,960 


3,020 


6,320 


7,090 


12,400 


14,300 


100 


154 


205 


350 


415 


665 


820 


1,510 


1,740 


2,710 


5,650 


6,350 


11,100 


12,800 


150 


124 


166 


•287 


339 


548 


672 


1,230 


1,420 


2,220 


4,600 


5,200 


9,130 


10,500 


200 


107 


143 


249 


294 


478 


584 


1,060 


1,220 


1,930 


3,980 


4,510 


7,930 


9,090 


250 


95 


128 


223 


263 


430 


524 


945 


1,090 


1,730 


3,550 


4,040 


7,110 


8,140 


300 


86 


116 


204 


240 


394 


479 


860 


995 


1,590 


3,240 


3,690 


6,500 


7,430 


400 


74 


100 


177 


208 


343 


416 


742 


858 


1,380 


2,800 


3,210 


5,650 


6,440 


500 


66 


89 


159 


186 


309 


373 


662 


766 


1,040 


2,500 


2,870 


5,060 


5,760 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Notes: 

1 . Table does not include effect of pressure drop across the hne regulator. Where regulator loss exceeds ^1^ psi, DO NOT USE THIS TABLE. Consult with the regula- 
tor manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate. 

2. CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guid- 
ance. 

3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L = 1 .3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends. 

4. EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

5. All table entries have been rounded to three significant digits. 



117.38 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 





TABLEC402.4(18) 
POLYETHYLENE PLASTIC PIPE 




Gas 


Natural 






Inlet Pressure 


Less than 2 


psi 






Pressure Drop 


0.3 in. w.c. 






Specific Gravity 


0.60 


PIPE SIZE (in.) 


Nominal OD 


'l2 


'U 


1 


1% 


1% 


2 ■ 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


153 


305 


551 


955 


1,440 


2,590 


20 


105 


210 


379 


656 


991 


1,780 


30 


84 


169 


304 


527 


796 


1,430 


40 


72 


144 


260 


451 


681 


1,220 


50 


64 


128 


231 


400 


604 


1,080 


60 


58 


116 


209 


362 


547 


983 


70 


53 


107 


192 


333 


503 


904 


80 


50 


99 


179 


310 


468 


841 


90 


46 


93 


168 


291 


439 


789 


100 


44 


88 


159 


275 


415 


745 


125 


39 


78 


141 


243 


368 


661 


150 


35 


71 


127 


221 


333 


598 


175 


32 


65 


117 


203 


306 


551 


200 


30 


60 


109 


189 


285 


512 


250 


27 


54 


97 


167 


253 


454 


300 


24 


48 


88 


152 


229 


411 


350 


22 


45 


81 


139 


211 


378 


400 


21 


42 


75 


130 


196 


352 


450 


19 


39 


70 


122 


184 


330 


500 


18 


37 


66 


115 


174 


312 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 

1 British thermal unit per hour = 

Note: All table entries have been rounded 



I mm, 1 pound per square inch = 6.895kPa, 1-inch water column = 0.2488 
0.2931 W, 1 cubic foot per hour = 0.0283 m%, 1 degree = 0.01745 rad. 
to three significant digits. 



kPa, 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.39 



APPENDIX C 





TABLE C402.4(19) 
POLYETHYLENE PLASTIC PIPE 




Gas 


Natural 






Inlet Pressure 


Less than 2 


psi 






Pressure Drop 


0.5 in. w.c. 






Specific Gravity 


0.60 






PIPE SIZE (in.) 






Nominal OD 


V, 


'U 


1 


IV4 


iv. 


2 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


201 


403 


726 


1,260 


1,900 


3,410 


20 


138 


277 


499 


865 


1,310 


2,350 


30 


111 


222 


401 


695 


1,050 


1,880 


40 


95 


190 


343 


594 


898 


1,610 


50 


84 


169 


304 


527 


796 


1,430 


60 


76 


153 


276 


477 


721 


1,300 


70 


70 


140 


254 


439 


663 


1,190 


80 


65 


131 


236 


409 


617 


1,110 


90 


61 


123 


221 


383 


579 


1,040 


100 


58 


116 


209 


362 


547 


983 


125 


51 


103 


185 


321 


485 


871 


150 


46 


93 


168 


291 


439 


789 


175 


43 


86 


154 


268 


404 


726 


200 


40 


80 


144 


249 


376 


675 


250 


35 


71 


127 


221 


333 


598 


300 


32 


64 


115 


200 


302 


542 


350 


29 


59 


106 


184 


278 


499 


400 


27 


55 


99 


171 


258 


464 


450 


26 


51 


93 


160 


242 


435 


500 


24 


48 


88 


152 


229 


411 



For SI: 1 inch = 25.4 mm, 1 foot = 304.J 

1 British thermal unit per hour = 

Note: All table entries have been rounded 



1 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 
0.2931 W, 1 cubic foot per hour = 0.0283 m'lh, 1 degree = 0.01745 rad. 
to three significant digits. 



kPa, 



117.40 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 





TABLE C402.4(20) 
POLYETHYLENE PLASTIC PIPE 




Gas 


Natural 






Inlet Pressure 


2.0 psi 






Pressure Drop 


1 .0 psi 






Specific Gravity 


0.60 


PIPE SIZE (in.) 


Nominal OD 


•/, 


\ 


1 


iV. 


iV, 


2 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


1,860 


3,720 


6,710 


11,600 


17,600 


31,600 


20 


1,280 


2,560 


4,610 


7,990 


12,100 


21,700 


30 


1,030 


2,050 


3,710 


6,420 


9,690 


17,400 


40 


878 


1,760 


3,170 


5,490 


8,300 


14,900 


50 


778 


1,560 


2,810 


4,870 


7,350 


13,200 


60 


705 


1,410 


2,550 


4,410 


6,660 


12,000 


70 


649 


1,300 


2,340 


4,060 


6,130 


11,000 


80 


603 


1,210 


2,180 


3,780 


5,700 


10,200 


90 


566 


1,130 


2,050 


3,540 


5,350 


9,610 


100 


535 


1,070 


1,930 


3,350 


5,050 


9,080 


125 


474 


949 


1,710 


2,970 


4,480 


8,050 


150 


429 


860 


1,550 


2,690 


4,060 


7,290 


175 


395 


791 


1,430 


2,470 


3,730 


6,710 


200 


368 


736 


1,330 


2,300 


3,470 


6,240 


250 


326 


652 


1,180 


2,040 


3,080 


5,530 


300 


295 


591 


1,070 


1,850 


2,790 


5,010 


350 


272 


544 


981 


1,700 


2,570 


4,610 


400 


253 


506 


913 


1,580 


2,390 


4,290 


450 


237 


475 


856 


1,480 


2,240 


4,020 


500 


224 


448 


809 


1,400 


2,120 


3,800 


550 


213 


426 


768 


1,330 


2,010 


3,610 


600 


203 


406 


733 


1,270 


1,920 


3,440 


650 


194 


389 


702 


1,220 


1,840 


3,300 


700 


187 


374 


674 


1,170 


1,760 


3,170 


750 


180 


360 


649 


1,130 


1,700 


3,050 


800 


174 


348 


627 


1,090 


1,640 


2,950 


850 


168 


336 


607 


1,050 


1,590 


2,850 


900 


163 


326 


588 


1,020 


1,540 


2,770 


950 


158 


317 


572 


990 


1,500 


2,690 


1,000 


154 


308 


556 


963 


1,450 


2,610 


1,100 


146 


293 


528 


915 


1,380 


2,480 


1,200 


139 


279 


504 


873 


1,320 


2,370 


1,300 


134 


267 


482 


836 


1,260 


2,270 


1,400 


128 


257 


463 


803 


1,210 


2,180 


1,500 


124 


247 


446 


773 


1,170 


2,100 


1,600 


119 


239 


431 


747 


1,130 


2,030 


1,700 


115 


231 


417 


723 


1,090 


1,960 


1,800 


112 


224 


404 


701 


1,060 


1,900 


1,900 


109 


218 


393 


680 


1,030 


1,850 


2,000 


106 


212 


382 


662 


1,000 


1,800 



For SI: 1 inch = 25.4 mm, 1 foot = 304. 

1 British thermal unit per hour = 

Note: All table entries have been rounded to 



8 mm, 1 pound per square inch = 6.895 kPa, 1-inch 
= 0.293 1 W, 1 cubic foot per hour = 0.0283 mlh, 1 
three significant digits. 



water column = 0.2488 kPa, 
degree = 0.01745 rad. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.41 



APPENDIX C 



TABLE C402.4(21) 
POLYETHYLENE PLASTIC TUBING 



TABLE C402.4(22) 
POLYETHYLENE PLASTIC TUBING 



Gas 


Natural 


Inlet Pressure 


Less than 2.0 psi 


Pressure Drop 


0.3 in. w.c. 


Specific Gravity 


0.60 






PLASTIC TUBING SIZE (CTS) (in.) 


Nominal OD 


v^ 


% 


Designation 


SDR 7.00 


SDR 11.00 


Actual ID 


0.445 


0.927 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


54 


372 


20 


37 


256 


30 


30 


205 


40 


26 


176 


50 


23 


156 


60 


21 


141 


70 


19 


130 


80 


18 


121 


90 


17 


113 


100 


16 


107 


125 


14 


95 


150 


13 


86 


175 


12 


79 


200 


11 


74 


225 


10 


69 


250 


NA 


65 


275 


NA 


62 


300 


NA 


59 


350 


NA 


54 


400 


NA 


51 


450 


NA 


47 


500 


NA 


45 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 

1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

I British thermal unit per hour = 0.2931 W, 

1 cubic foot per hour = 0.0283 m%, 1 degree = 0.01745 rad. 

Notes: 

1 . NA means a flow of less than 1 cfh. 

2. All table entries have been rounded to three significant digits. 



Gas 


Natural 


Inlet Pressure 


Less than 2.0 psi 


Pressure Drop 


0.5 in. w.c. 


Specific Gravity 


0.60 






PLASTIC TUBING SIZE (CTS) (in.) 


Nominal OD 


'/a 


% 


Designation 


SDR 7.00 


SDR 11.00 


Actual ID 


0.445 


0.927 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


72 


490 


20 


49 


337 


30 


39 


271 


40 


34 


232 


50 


30 


205 


60 


27 


186 


70 


25 


171 


80 


23 


159 


90 


22 


149 


100 


21 


141 


125 


18 


125 


150 


17 


113 


175 


15 


104 


200 


14 


97 


225 


13 


91 


250 


12 


86 


275 


11 


82 


300 


11 


78 


350 


10 


72 


400 


NA 


67 


450 


NA 


63 


500 


NA 


59 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 

1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 

1 cubic foot per hour = 0.0283 m%, 1 degree = 0.01745 rad. 

Notes: 

1 . NA means a flow of less than 10 cfh. 

2. All table entries have been rounded to three significant digits. 



117.42 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 





Gas 


Undiluted Propane 


TABLE C402.4(23) 
SCHEDULE 40 METALLIC PIPE 


Inlet Pressure 


10.0 psi 


Pressure Drop 


1 .0 psi 




Specific Gravity 


1.50 


SPECIAL USE 


Pipe sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator). 




PIPE SIZE (in.) 


Nominal 


'/2 


% 


1 l'/4 


l'/2 


2 


2'/2 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


3,320 


6,950 


13,100 


26,900 


40,300 


77,600 


124,000 


219,000 


446,000 


20 


2,280 


4,780 


9,000 


18,500 


27,700 


53,300 


85,000 


150,000 


306,000 


30 


1,830 


3,840 ^ 


7,220 


14,800 


22,200 


42,800 


68,200 


121,000 


246,000 


40 


1,570 


3,280 


6,180 


12,700 


19,000 


36,600 


58,400 


103,000 


211,000 


50 


1,390 


2,910 


5,480 


11,300 


16,900 


32,500 


51,700 


91,500 


187,000 


60 


1,260 


2,640 


4,970 


10,200 


15,300 


29,400 


46,900 


82,900 


169,000 


70 


1,160 


2,430 


4,570 


9,380 


14,100 


27,100 


43,100 


76,300 


156,000 


80 


1,080 


2,260 


4,250 


8,730 


13,100 


25,200 


40,100 


70,900 


145,000 


90 


1,010 


2,120 


3,990 


8,190 


12,300 


23,600 


37,700 


66,600 


136,000 


100 


956 


2,000 


3,770 


7,730 


11,600 


22,300 


35,600 


62,900 


128,000 


125 


848 


1,770 


3,340 


6,850 


10,300 


19,800 


31,500 


55,700 


1 14,000 


150 


768 


1,610 


3,020 


6,210 


9,300 


17,900 


28,600 


50,500 


103,000 


175 


706 


1,480 


2,780 


5,710 


8,560 


16,500 


26,300 


46,500 


94,700 


200 


657 


1,370 


2,590 


5,320 


7,960 


15,300 


24,400 


43,200 


88,100 


250 


582 


1,220 


2,290 


4,710 


7,060 


13,600 


21,700 


38,300 


78,100 


300 


528 


1,100 


2,080 


4,270 


6,400 


12,300 


19,600 


34,700 


70,800 


350 


486 


1,020 


1,910 


3,930 


5,880 


11,300 


18,100 


31,900 


65,100 


400 


452 


945 


1,780 


3,650 


5,470 


10,500 


16,800 


29,700 


60,600 


450 


424 


886 


1,670 


3,430 


5,140 


9,890 


15,800 


27,900 


56,800 


500 


400 


837 


1,580 


3,240 


4,850 


9,340 


14,900 


26,300 


53,700 


550 


380 


795 


1,500 


3,070 


4,610 


8,870 


14,100 


25,000 


51,000 


600 


363 


759 


1,430 


2,930 


4,400 


8,460 


13,500 


23,900 


48,600 


650 


347 


726 


1,370 


2,810 


4,210 


8,110 


12,900 


22,800 


46,600 


700 


334 


698 


1,310 


2,700 


4,040 


7,790 


12,400 


21,900 


44,800 


750 


321 


672 


1,270 


2,600 


3,900 


7,500 


12,000 


21,100 


43,100 


800 


310 


649 


1,220 


2,510 


3,760 


7,240 


11,500 


20,400 


41,600 


850 


300 


628 


1,180 


2,430 


3,640 


7,010 


11,200 


19,800 


40,300 


900 


291 


609 


1,150 


2,360 


3,530 


6,800 


10,800 


19,200 


39,100 


950 


283 


592 


1,110 


2,290 


3,430 


6,600 


10,500 


18,600 


37,900 


1,000 


275 


575 


1,080 


2,230 


3,330 


6,420 


10,200 


18,100 


36,900 


1,100 


261 


546 


1,030 


2,110 


3,170 


6,100 


9,720 


17,200 


35,000 


1,200 


249 


521 


982 


2,020 


3,020 


5,820 


9,270 


16,400 


33,400 


1,300 


239 


499 


940 


1,930 


2,890 


5,570 


8,880 


15,700 


32,000 


1,400 


229 


480 


903 


1,850 


2,780 


5,350 


8,530 


15,100 


30,800 


1,500 


221 


462 


870 


1,790 


2,680 


5,160 


8,220 


14,500 


29,600 


1,600 


213 


446 


840 


1,730 


2,590 


4,980 


7,940 


14,000 


28,600 


1,700 


206 


432 


813 


1,670 


2,500 


4,820 


7,680 


13,600 


27,700 


1,800 


200 


419 


789 


1,620 


2,430 


4,670 


7,450 


13,200 


26,900 


1,900 


194 


407 


766 


1,570 


2,360 


4,540 


7,230 


12,800 


26,100 


2,000 


189 


395 


745 


1,530 


2,290 


4,410 


7,030 


12,400 


25,400 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column - 0.2488 kPa, 

1 British thermal unit per hour - 0.293 1 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Note: All table entries have been rounded to three significant digits. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.43 



APPENDIX C 





Gas 


Undiluted Propane 


TABLE C402.4(24) 
SCHEDULE 40 METALLIC PIPE 


Inlet Pressure 


10.0 psi 


Pressure Drop 


3.0 psi 




Specific Gravity 


1.50 


SPECIAL USE 


Pipe sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator). 


PIPE SIZE (In) 


Nominal 


'/2 


% 


1 


l'/4 


I'll 


2 


2V2 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


5,890 


12,300 


23,200 


47,600 


71,300 


137,000 


219,000 


387,000 


789,000 


20 


4,050 


8,460 


15,900 


32,700 


49,000 


94,400 


150,000 


266,000 


543,000 


30 


3,250 


6,790 


12,800 


26,300 


39,400 


75,800 


121,000 


214,000 


436,000 


40 


2,780 


5,810 


11,000 


22,500 


33,700 


64,900 


103,000 


183.000 


373,000 


50 


2,460 


5,150 


9,710 


19,900 


29,900 


57,500 


91,600 


162.000 


330,000 


60 


2,230 


4,670 


8,790 


18,100 


27,100 


52,100 


83,000 


147,000 


299,000 


70 


2,050 


4,300 


8,090 


16,600 


24,900 


47,900 


76,400 


135,000 


275,000 


80 


1,910 


4,000 


7,530 


15,500 


23,200 


44,600 


71,100 


126,000 


256,000 


90 


1,790 


3,750 


7,060 


14,500 


21,700 


41,800 


66,700 


118,000 


240,000 


100 


1,690 


3,540 


6,670 


13,700 ' 


20,500 


39,500 


63,000 


111,000 


227,000 


125 


1,500 


3,140 


5,910 


12,100 


18,200 


35,000 


55,800 


98,700 


201,000 


150 


1,360 


2,840 


5,360 


11,000 


16,500 


31,700 


50,600 


89,400 


182,000 


175 


1,250 


2,620 


4,930 


10,100 


15,200 


29,200 


46,500 


82,300 


167,800 


200 


1,160 


2,430 


4,580 


9,410 


14,100 


27,200 


43,300 


76,500 


156,100 


250 


1,030 


2,160 


4,060 


8,340 


12,500 


24,100 


38,400 


67,800 


138,400 


300 


935 


1,950 


3,680 


7,560 


11,300 


21,800 


34,800 


61, .500 


125,400 


350 


860 


1,800 


3,390 


6,950 


10,400 


20,100 


32,000 


56,500 


115,300 


400 


800 


1,670 


3,150 


6,470 


9,690 


18,700 


29,800 


52,600 


107,300 


450 


751 


1,570 


2,960 


6,070 


9,090 


17,500 


27,900 


49,400 


100,700 


500 


709 


1,480 


2,790 


5,730 


8,590 


16,500 


26,400 


46,600 


95,100 


550 


673 


1,410 


2,650 


5,450 


8,160 


15,700 


25,000 


44,300 


90,300 


600 


642 


1,340 


2,530 


5,200 


7,780 


15,000 


23,900 


42,200 


86,200 


650 


615 


1,290 


2,420 


4,980 


7,450 


14,400 


22,900 


40,500 


82,500 


700 


591 


1,240 


2,330 


4,780 


7,160 


13,800 


22,000 


38,900 


79,300 


750 


569 


1,190 


2,240 


4,600 


6,900 


13,300 


21,200 


37,400 


76,400 


800 


550 


1,150 


2,170 


4,450 


6,660 


12,800 


20,500 


36,200 


73,700 


850 


532 


1,110 


2,100 


4,300 


6,450 


12,400 


19,800 


35,000 


71,400 


900 


516 


1,080 


2,030 


4,170 


6,250 


12,000 


19,200 


33,900 


69,200 


950 


501 


1,050 


1,970 


4,050 


6,070 


11,700 


18,600 


32,900 


67,200 


1,000 


487 


1,020 


1,920 


3,940 


5,900 


11,400 


18,100 


32,000 


65,400 


1,100 


463 


968 


1,820 


3,740 


5,610 


10,800 


17,200 


30,400 


62,100 


1,200 


442 


923 


1,740 


3,570 


5,350 


10,300 


16,400 


29,000 


59,200 


1,300 


423 


884 


1,670 


3,420 


5,120 


9,870 


15,700 


27,800 


56,700 


1,400 


406 


849 


1,600 


3,280 


4,920 


9,480 


15,100 


26,700 


54,500 


1,500 


391 


818 


1,540 


3,160 


4,740 


9,130 


14,600 


25,700 


52,500 


1,600 


378 


790 


1,490 


3,060 


4,580 


8,820 


14,100 


24,800 


50,700 


1,700 


366 


765 


1,440 


2,960 


4,430 


8,530 


13,600 


24,000 


49,000 


1,800 


355 


741 


1,400 


2,870 


4,300 


8,270 


13,200 


23,300 


47,600 


1,900 


344 


720 


1,360 


2,780 


4,170 


8,040 


12,800 


22,600 


46,200 


2,000 


335 


700 


1,320 


2,710 


4,060 


7,820 


12,500 


22,000 


44,900 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 mVh, 1 degree = 0.01745 rad. 
Note: All table entries have been rounded to three significant digits. 



117.44 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 





TABLE C402.4(25) 
SCHEDULE 401 METALLIC PIPE 




Gas 


Undiluted Propane 




Inlet Pressure 


2.0 psi 




Pressure Drop 


1.0 psi 




Specific Gravity 


1.50 










PIPE SIZE (In.) 


Nominal 


'/2 


'U 


1 


IV4 


IV2 


2 


2'/2 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


2,680 


5,590' 


10,500 


21,600 


32,400 


62,400 


99,500 


176,000 


359,000 


20 


1,840 


3,850 


7,240 


14,900 


22,300 


42,900 


68,400 


121,000 


247,000 


30 


1,480 


3,090 


5,820 


11,900 


17,900 


. 34,500 


54,900 


97,100 


198,000 


40 


1,260 


2,640' 


4,980 


10,200 


15,300 


29,500 


47,000 


83,100 


170,000 


50 


1,120 


2,340 


4,410 


9,060 


13,600 


26,100 


41,700 


73,700 


150,000 


60 


1,010 


2,120 


4,000 


8,210 


12,300 


23,700 


37,700 


66,700 


136,000 


70 


934 


1,950 


3,680 


7,550 


11,300 


21,800 


34,700 


61,400 


125,000 


80 


869 


1,820 


3,420 


7,020 


10,500 


20,300 


32,300 


57,100 


116,000 


90 


815 


1,700 


3,210 


6,590 


9,880 


19,000 


30,300 


53,600 


109,000 


100 


770 


1,610 


3,030 


6,230 


9,330 


18,000 


28,600 


50,600 


103,000 


125 


682 


1,430' 


2,690 


5,520 


8,270 


15,900 


25,400 


44,900 


91,500 


150 


618 


1,290 


2,440 


5,000 


7,490 


14,400 


23,000 


40,700 


82,900 


175 


569 


1,190 


2,240 


4,600 


6,890 


13,300 


21,200 


37,400 


76,300 


200 


529 


1,110 


2,080 


4,280 


6,410 


12,300 


19,700 


34,800 


71,000 


250 


469 


981 


1,850 


3,790 


5,680 


10,900 


17,400 


30,800 


62,900 


300 


425 


889 


1,670 


3,440 


5,150 


9,920 


15,800 


27,900 


57,000 


350 


391 


817 


1,540 


3,160 


4,740 


9,120 


14,500 


25,700 


52,400 


400 


364 


760 


1,430 


2,940 


4,410 


8,490 


13,500 


23,900 


48,800 


450 


341 


714 


1,340 


2,760 


4,130 


7,960 


12,700 


22,400 


45,800 


500 


322 


674 


1,270 


2,610 


3,910 


7,520 


12,000 


21,200 


43,200 


550 


306 


640 


1,210 


2,480 


3,710 


7,140 


11,400 


20,100 


41,100 


600 


292 


611 


1,150 


2,360 


3,540 


6,820 


10,900 


19,200 


39,200 


650 


280 


585 


1,100 


2,260 


3,390 


6,530 


10,400 


18,400 


37,500 


700 


269 


562 


1,060 


2,170 


3,260 


6,270 


9,990 


17,700 


36,000 


750 


259 


541 


1,020 


2,090 


3,140 


6,040 


9,630 


17,000 


34,700 


800 


250 


523 


985 


2,020 


3,030 


5,830 


9,300 


16,400 


33,500 


850 


242 


506 


953 


1,960 


2,930 


5,640 


9,000 


15,900 


32,400 


900 


235 


490 


924 


1,900 


2,840 


5,470 


8,720 


15,400 


31,500 


950 


228 


476 


897 


1,840 


2,760 


5,310 


8,470 


15,000 


30,500 


1,000 


222 


463 


873 


1,790 


2,680 


5,170 


8,240 


14,600 


29,700 


1,100 


210 


440 


829 


1,700 


2,550 


4,910 


7,830 


13,800 


28,200 


1,200 


201 


420 


791 


1,620 


2,430 


4,680 


7,470 


13,200 


26,900 


1,300 


192 


402 


757 


1,550 


2,330 


4,490 


7,150 


12,600 


25,800 


1,400 


185 


386 


727 


1,490 


2,240 


4,310 


6,870 


12,100 


24,800 


1,500 


178 


372 


701 


1,440 


2,160 


4,150 


6,620 


11,700 


23,900 


1,600 


172 


359 


677 


1,390 


2,080 


4,010 


6,390 


11,300 


23,000 


1,700 


166 


348 


655 


1,340 


2,010 


3,880 


6,180 


10,900 


22,300 


1,800 


161 


337 


635 


1,300 


1,950 


3,760 


6,000 


10,600 


21,600 


1,900 


157 


327 , 


617 


1,270 


1,900 


3,650 


5,820 


10,300 


21,000 


2,000 


152 


318 


600 


1,230 


1,840 


3,550 


5,660 


10,000 


20,400 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch - 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour == 0.0283 mlh, 1 degree = 0.01745 rad. 
Note: All table entries have been rounded to three significant digits. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.45 



APPENDIX C 





Gas 


Undiluted Propane 


TABLE C402.4(26) 
SCHEDULE 40 METALLIC P!PE 


Inlet Pressure 


11.0in. w.c. 


Pressure Drop 


0.5 in. w.c. 




Specific Gravity 


1 .50 






SPECIAL USE 


Pipe sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator). 


PIPE SIZE (in.) 


Nominal 


V2 


% 


1 


l'/4 


I'll 


2 


2% 


3 


'4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


291 


608 


1,150 


2,350 


3,520 


6,790 


10,800 


19,100 


39,000 


20 


200 


418 


787 


1,620 


2,420 


4,660 


7,430 


13,100 


26,800 


30 


160 


336 


632 


1,300 


1,940 


3,750 


5,970 


10,600 


21,500 


40 


137 


287 


541 


1,110 


1,660 


3,210 


5,110 


9,030 


18,400 


50 


122 


255 


480 


985 


1,480 


2,840 


4,530 


8,000 


16,300 


60 


110 


231 


434 


8921 


1,340 


2,570 


4,100 


7,250 


14,800 


80 


101 


212 


400 


821 


1,230 


2,370 


3,770 


6,670 


13,600 


100 


94 


197 


372 


763 


1,140 


2,200 


3,510 


6,210 


12,700 


125 


89 


185 


349 


716 


1,070 


2,070 


3,290 


5,820 


11,900 


150 


84 


175 


330 


677 


1,010 


1,950 


3,110 


5,500 


11,200 


175 


74 


155 


292 


600 


899 


1,730 


2,760 


4,880 


9,950 


200 


67 


140 


265 


543 


814 


1,570 


2,500 


4,420 


9,010 


250 


62 


129 


243 


500 


749 


1,440 


2,300 


4,060 


8,290 


300 


58 


120 


227 


465 


697 


1,340 


2,140 


3,780 


7,710 


350 


51 


107 


201 


412 


618 


1,190 


1,900 


3,350 


6,840 


400 


46 


97 


182 


373 


560 


1,080 


1,720 


3,040 


6,190 


450 


42 


89 


167 


344 


515 


991 


1,580 


2,790 


5,700 


500 


40 


83 


156 


320 


479 


922 


1,470 


2,600 


5,300 


550 


37 


78 


146 


300 


449 


865 


1,380 


2,440 


4,970 


600 


35 


73 


138 


283 


424 


817 


1,300 


2,300 


4,700 


650 


33 


70 


131 


269 


403 


776 


1,240 


2,190 


4,460 


700 


32 


66 


125 


257 


385 


741 , 


1,180 


2,090 


4,260 


750 


30 


64 


120 


246 


368 


709 


1,130 


2,000 


4,080 


800 


29 


61 


115 


236 


354 


681 


1,090 


1,920 


3,920 


850 


28 


59 


111 


227 


341 


656 


1,050 


1,850 


3,770 


900 


27 


57 


107 


220 


329 


634 


1,010 


1,790 


3,640 


950 


26 


55 


104 


213 


319 


613 


978 


1,730 


3,530 


1,000 


25 


53 


100 


206 


309 


595 


948 


1,680 


■3,420 


1,100 


25 


52 


97 


200 


300 


578 


921 


1,630 


3,320 


1,200 


24 


50 


95 


195 


292 


562 


895 


1,580 


3,230 


1,300 


23 


48 


90 


185 


277 


534 


850 


1,500 


3,070 


1,400 


22 


46 


86 


176 


264 


509 


811 


1,430 


2,930 


1,500 


21 


44 


82 


169 


253 


487 


777 


1,370 


2,800 


1,600 


20 


42 


79 


162 


243 


468 


746 


1,320 


2,690 


1,700 


19 


40 


76 


156 


234 


451 


719 


1,270 


2,590 


1,800 


19 


39 


74 


151 


226 


436 


694 


1,230 


2,500 


1,900 


18 


38 


71 


146 


219 


422 


672 


1,190 


2,420 


2,000 


18 


37 


69 


142 


212 


409 


652 


1,150 


2,350 



For SI: 1 inch = 25.4 mm, 1 foot = 304. f 

1 British thermal unit per hour = 

Note: All table entries have been rounded 



1 mm, 1 pound per square inch = 6. 
0.2931 W, 1 cubic foot per hour = 
to three significant digits. 



895 kPa, 1-inch water column = 0.2488 
0.0283 m%, 1 degree = 0.01745 rad. 



kPa, 



117.46 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 





TABLE C402.4(27) 
SEMIRIGID COPPER TUBING 




Gas 


Undiluted Propane 




Inlet Pressure 


10.0 psi 




Pressure Drop 


1.0 psi 




Specific Gravity 


1.50 










SPECIAL USE 


Sizing between first stage (high-pressure 


regulator) and second stage (low-pressure regulator). 




TUBE SIZE (In.) 


Nominal 


K&L 


•A 


Vs 


'/2 


^/8 


% 


1 


l'/4 


l'/2 


2 


ACR 


% 


'/2 


^/8 


% 


'/8 


l'/8 


iVs 





— 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305. 


0.402 


• 0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 




Capacity in Thousands of Btu per Hour 




10 


513 


1,060 


2,150 


3,760 


5,330 


1 1 ,400 


20,500 


32,300 


67,400 


20 


352 


727 


1,480 


2,580 


3,670 


7,830 


14,100 


22,200 


46,300 


30 


283 


584 


1,190 


2,080 


2,940 


6,290 


11,300 


17,900 


37,200 


40 


242 


500 


1,020 


1,780 


2,520 


5,380 


9,690 


15,300 


31,800 


50 


215 


443 


901 


1,570 


2,230 


4,770 


8,590 


13,500 


28,200 


60 


194 


401 


816 


1,430 


2,020 


4,320 


7,780 


12,300 


25,600 


70 


179 


369 


751' 


1,310 


1,860 


3,980 


7,160 


1 1,300 


23,500 


80 


166 


343 


699 


1,220 


1,730 


3,700 


6,660 


10,500 


21,900 


90 


156 


322 


655 • 


1,150 


1,630 


3,470 


6,250 


9,850 


20,500 


100 


147 


304 


619 


1,080 


1,540 


3,280 


5,900 


9,310 


19,400 


125 


131 


270 


549 


959 


1,360 


2,910 


5,230 


8,250 


17,200 


150 


118 


244 


497 


869 


1,230 


2,630 


4,740 


7,470 


15,600 


175 


109 


225 


457 


799 


1,130 


2,420 


4,360 


6,880 


14,300 


200 


101 


209 


426 


744 


1,060 


2,250 


4,060 


6,400 


13,300 


250 


90 


185 


377 


659 


935 


2,000 


3,600 


5,670 


11,800 


300 


81 


168 


342 


597 


847 


1,810 


3,260 


5,140 


10,700 


350 


75 


155 


314 


549 


779 


1,660 


3,000 


4,730 


9,840 


400 


70 


144 


292 


511 


725 


1,550 


2,790 


4,400 


9,160 


450 


65 


135 


274 


480 


680 


1,450 


2,620 


4,130 


8,590 


500 


62 


127 


259 


453 


643 


1,370 


2,470 


3,900 


8,120 


550 


59 


121 


246 


430 


610 


1,300 


2,350 


3,700 


7,710 


600 


56 


115 


235 


410 


582 


1,240 


2,240 


3,530 


7,350 


650 


54 


111 


225 


393 


558 


1,190 


2,140 


3,380 


7,040 


700 


51 


106 


216 


378 


536 


1,140 


2,060 


3,250 


6,770 


750 


50 


102 


208 


364 


516 


1,100 


1,980 


3,130 


6,520 


800 


48 


99 


201 


351 


498 


1,060 


1,920 


3,020 


6,290 


850 


46 


96 


195 


340 


482 


1,030 


1,850 


2,920 


6,090 


900 


45 


93 


189 


330 


468 


1,000 


1,800 


2,840 


5,910 


950 


44 


90 


183 


320 


454 


970 


1,750 


2,750 


5,730 


1,000 


42 


88 


178 


311 


442 


944 


1,700 


2,680 


5,580 


1,100 


40 


83 


169 


296 


420 


896 


1,610 


2,540 


5,300 


1,200 


38 


79 


161 


282 


400 


855 


1,540 


2,430 


5,050 


1,300 


37 


76 


155 


270 


383 


819 


1,470 


2,320 


4,840 


1,400 


35 


73 


148 


260 


368 


787 


1,420 


2,230 


4,650 


1,500 


34 


70 


143 


250 


355 


758 


1,360 


2,150 


4,480 


1,600 


33 


68 


138 


241 


343 


732 


1,320 


2,080 


4,330 


1,700 


32 


66 


134 


234 


331 


708 


1,270 


2,010 


4,190 


1,800 


31 


64 


130 


227 


321 


687 


1,240 


1,950 


4,060 


1,900 


30 


62 


126 


220 


312 


667 


1,200 


1,890 


3,940 


2,000 


29 


60 


122 


214 


304 


648 


1,170 


1,840 


3,830 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour - 0.0283 m'/h, 1 degree = 6.01745 rad. 
Notes: 

1 . Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. All table entries have been rounded to three significant digits. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.47 



APPENDIX C 
















Gas 


Undiluted Propane 


TABLE C402.4(28) 
SEMIRIGID COPPER TUBING 


Inlet Pressure 


11.0 in. w.c. 


Pressure Drop 


0.5 in. w.c. 




Specific Gravity 


1.50 






SPECIAL USE 


Sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator) 


TUBE SIZE (in.) 


Nominal 


K&L 


'/4 


'/s 


'/2 


% 


% 


1 


IV4 


l'/2 


2 


ACR 


Vs 


'/2 


^/8 


% 


\ 


l'/8 


1% 








Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


45 


93 


188 


329 


467 


997 


1,800 


2,830 


5,890 


20 


31 


64 


129 


226 


321 


685 


1.230 


1,950 


4,050 


30 


25 


51 


104 


182 


258 


550 


991 


1,560 


3,250 


40 


21 


44 


89 


155 


220 


471 


848 


1,340 


2,780 


50 


19 


39 


79 


138 


195 


417 


752 


1,180 


2,470 


60 


17 


35 


71 


125 


177 


378 


681 


1,070 


2,240 


70 


16 


32 


66 


115 


163 


348 


626 


988 


2,060 


80 


15 


30 


61 


107 


152 


324 


583 


919 


1,910 


90 


14 


28 


57 


100 


142 


304 


547 


862 


1,800 


100 


13 


27 


54 


95 


134 


287 


517 


814 


1,700 


125 


11 


24 


48 


84 


119 


254 


458 


722 


1,500 


150 


10 


21 


44 


76 


108 


230 


415 


654 


1,360 


175 


NA 


20 


40 


70 


99 


212 


382 


602 


1,250 


200 


NA 


18 


37 


65 


92 


197 


355 


560 


1,170 


250 


NA 


16 


33 


58 


82 


175 


315 


496 


1,030 


300 


NA 


15 


30 


52 


74 


158 


285 


449 


936 


350 


NA 


14 


28 


48 


68 


146 


262 


414 


861 


400 


NA 


13 


26 


45 


63 


136 


244 


385 


801 


450 


NA 


12 


24 


42 


60 


127 


229 


361 


752 


500 


NA 


11 


23 


40 


56 


120 


216 


341 


710 


550 


NA 


11 


22 


38 


53 


114 


205 


324 


674 


600 


NA 


10 


21 


36 


51 


109 


196 


309 


643 


650 


NA 


NA 


20 


34 


49 


104 


188 


296 


616 


700 


NA 


NA 


19 


33 


47 


100 


180 


284 


592 


750 


NA 


NA 


18 


32 


45 


96 


174 


274 


570 


800 


NA 


NA 


18 


31 


44 


93 


168 


264 


551 


850 


NA 


NA 


17 


30 


42 


90 


162 


256 


533 


900 


NA 


NA 


17 


29 


41 


87 


157 


248 


517 


950 


NA 


NA 


16 


28 


40 


85 


153 


241 


502 


1,000 


NA 


NA 


16 


27 


39 


83 


149 


234 


488 


1,100 


NA 


NA 


15 


26 


37 


78 


141 


223 


464 


1,200 


NA 


NA 


14 


25 


35 


75 


135 


212 


442 


1,300 


NA 


NA 


14 


24 


34 


72 


129 


203 


423 


1,400 


NA 


NA 


13 


23 


32 


69 


124 


195 


407 


1,500 


NA 


NA 


13 


22 


31 


66 


119 


188 


392 


1,600 


NA 


NA 


12 


21 


30 


64 


115 


182 


378 


1,700 


NA 


NA 


12 


20 


29 


62 


112 


176 


366 


1,800 


NA 


NA 


11 


20 


28 


60 


108 


170 


355 


1,900 


NA 


NA 


11 


19 


27 


58 


105 


166 


345 


2,000 


NA 


NA 


11 


19 


27 


57 


102 


161 


335 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour - 0.0283 m'/h, 1 degree = 0.01745 rad. 
Notes: 

1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. NA means a flow of less than 10,000 Btu^r. 

3. All table entries have been rounded to three significant digits. 



117.48 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 





TABLE C402.4(29) 
SEMIRIGID COPPER TUBING 




Gas 


Undiluted Propane 




Inlet Pressure 


2.0 psi 




Pressure Drop 


1 .0 psi 




Specific Gravity 


1.50 












TUBE SIZE (In.) 


Nominal 


K&L 


V4 


^8 


'/2 


% 


V4 


1 


IV4 


IV2 


2 


ACR 


% 


V2 


% 


% 


Vs 


iVg 


1% 


— 


— 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Tiiousands of Btu per Hour 


10 


413 


852 


1,730 


3,030 


4,300 


9,170 


16,500 


26,000 


54,200 


20 


284 


585 


1,190 


2,080 


2,950 


6,310 


11,400 


17,900 


37,300 


30 


228 


470 


956 


1,670 


2,370 


5,060 


9,120 


14,400 


29,900 


40 


195 


402 


818 


1,430 


2,030 


4,330 


7,800 


12,300 


25,600 


50 


173 


356 


725 


1,270 


1,800 


3,840 


6,920 


10,900 


22,700 


60 


157 


323 


657 


1,150 


1,630 


3,480 


6,270 


9,880 


20,600 


70 


144 


297 


605 


1,060 


1,500 


3,200 


5,760 


9,090 


18,900 


80 


134 


276 


562 


983 


1,390 


2,980 


5,360 


8,450 


17,600 


90 


126 


259 


528 


922 


1,310 


2,790 


5,030 


7,930 


16,500 


100 


119 


245 


498 


871 


1,240 


2,640 


4,750 


7,490 


15,600 


125 


105 


217 


442 


772 


1,100 


2,340 


4,210 


6,640 


13,800 


150 


95 


197 


400 


700 


992 


2,120 


3,820 


6,020 


12,500 


175 


88 


181 


368 


644 


913 


1,950 


3,510 


5,540 


11,500 


200 


82 


168 


343 


599 


849 


1,810 


3,270 


5,150 


10,700 


250 


72 


149 


304 


531 


753 


1,610 


2,900 


4,560 


9,510 


300 


66 


135 


275 


481 


682 


1,460 


2,620 


4,140 


8,610 


350 


60 


124 


253 


442 


628 


1,340 


2,410 


3,800 


7,920 


400 


56 


116 


235 


411 


584 


1,250 


2,250 


3,540 


7,370 


450 


53 


109 


221 


386 


548 


1,170 


2,110 


3,320 


6,920 


500 


50 


103 


209 


365 


517 


1,110 


1,990 


3,140 


6,530 


550 


47 


97 


198 


346 


491 


1,050 


1,890 


2,980 


6,210 


600 


45 


93 


189 


330 


469 


1,000 


1,800 


2,840 


5,920 


650 


43 


89 


181 


316 


449 


959 


1,730 


2,720 


5,670 


700 


41 


86 


174 


304 


431 


921 


1,660 


2,620 


5,450 


750 


40 


82 


168 


293 


415 


888 


1,600 


2,520 


5,250 


800 


39 


80 


162 


283 


401 


857 


1,540 


2,430 


5,070 


850 


37 


77 


157 


274 


388 


829 


1,490 


2,350 


4,900 


900 


36 


75 


152 


265 


376 


804 


1,450 


2,280 


4,750 


950 


35 


72 


147 


258 


366 


L 781 


1,410 


2,220 


4,620 


1,000 


34 


71 


143 


251 


356 


760 


1,370 


2,160 


4,490 


1,100 


32 


67 


136 


238 


338 


721 


1,300 


2,050 


4,270 


1,200 


31 


64 


130 


227 


322 


688 


1,240 


1,950 


4,070 


1,300 


30 


61 


124 


217 


309 


659 


1,190 


1,870 


3,900 


1,400 


28 


59 


120 


209 


296 


633 


1,140 


1,800 


3,740 


1,500 


27 


57 


115 


201 


286 


610 


1,100 


1,730 


3,610 


1,600 


26 


55 ,, 


111 


194 


276 


589 


1,060 


1,670 


3,480 


1,700 


26 ■ 


53 


108 


188 


267 


570 


1,030 


1,620 


3,370 


1,800 


25 


51 


104 


182 


259 


553 


1,000 


1,570 


3,270 


1,900 


24 


50 


101 


177 


251 


537 


966 


1,520 


3,170 


2,000 


23 


48 


99 


172 


244 


522 


940 


1,480 


3,090 



For SI: 



Notes: 



1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 
1 British thermal unit per hour - 0.2931 W, 1 cubic foot per hour - 0.0283 m'/h, 1 degree = 0.01745 rad. 



1 . Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. All table entries have been rounded to three significant digits. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.49 



APPENDIX C 





Gas 


Jncliluted Propane 


TABLE C402.4(30) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure 


1.0 in. w.c. 


Pressure Drop ( 


).5 in. w.c. 




Specific Gravity 


.50 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity in Thousands of Btu per Hour 


5 


72 


99 


181 


211 


355 


426 


744 


863 


1,420 


2,830 


3,270 


5,780 


6,550 


10 


50 


69 


129 


150 


254 


303 


. 521 


605 


971 


1,990 


2,320 


4,110 


4,640 


15 


39 


55 


104 


121 


208 


248 


422 


490 


775 


1,620 


1,900 


3,370 


3,790 


20 


34 


49 


91 


106 


183 


216 


365 


425 


661 


1,400 


1,650 


2,930 


3,290 


25 


30 


42 


82 


94 


164 


192 


325 


379 


583 


1,250 


1,480 


2,630 


2,940 


30 


28 


39 


74 


87 


151 


177 


297 


344 


528 


1,140 


1,350 


2,400 


2,680 


40 


23 


33 


64 


74 


131 


153 


256 


297 


449 


988 


1,170 


2,090 


2,330 


50 


20 


30 


58 


66 


118 


137 


227 


265 


397 


884 


1,050 


1,870 


2,080 


60 


19 


26 


53 


60 


107 


126 


207 


241 


359 


805 


961 ! 1,710 


1,900 


70 


17 


25 


49 


57 


99 


117 


191 


222 


330 


745 


890 


1,590 


1,760 


80 


15 


23 


45 


52 


94 


109 


178 


208 


307 


696 


833 


1,490 


1,650 


90 


15 


22 


44 


50 


90 


102 


169 


197 


286 


656 


787 


1,400 


1,550 


100 


14 


20 


41 


47 


85 


98 


159 


186 


270 


621 


746 


1,330 


1,480 


150 


11 


15 


31 


36 


66 


75 


123 


143 


217 


L 506 


611 


1,090 


1,210 


200 


9 


14 


28 


33 


60 


69 


112 


129 


183 


438 


531 


948 


1,050 


250 


8 


12 


25 


30 


53 


61 


99 


117 


163 


390 


476 


850 


934 


300 


8 


11 


23 


26 


50 


57 


90 


107 


147 


357 


434 


777 


854 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square incii = 6.895kPa, 1-inch water column = 0.2488 icPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 nv'/h, 1 degree = 0.01745 rad. 
Notes: 

1 . Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L = 1.3« where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends. 

2. EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

3. All table entries have been rounded to three significant digits. 



117.50 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 





Gas I 


Jndiluted Propane 


TABLE C402.4(31) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure 2 


?.0 psi 


Pressure Drop 


.0 psi 




Specific Gravity 


.50 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 23 


25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


426 


558 


■927 


1,110 


1,740 


2,170 


4,100 


4,720 


7,130 


15,200 


16,800 


29,400 


34,200 


25 


262 


347 


591 


701 


1,120 


1,380 


2,560 


2,950 


4,560 


9,550 


10,700 


18,800 


21,700 


30 


238 


316 


540 


640 


1,030 


1,270 


2,330 


2,690 


4,180 


8,710 


9,790 


17,200 


19,800 


40 


203 


271 


469 


554 


896 


1,100 


2,010 


2,320 


3,630 


7,530 


8,500 


14,900 


17,200 


50 


181 


243 


420 


496 


806 


986 


1,790 


2,070 


3,260 


6,730 


7,610 


13,400 


15,400 


75 


147 


196 


344 


406 


663 


809 


1,460 


1,690 


2,680 


5,480 


6,230 


11,000 


12,600 


80 


140 


189 


333 


393 


643 


768 


1,410 


1,630. 


2,590 


5,300 


6,040 


10,600 


12,200 


100 


124 


169 


298 


350 


578 


703 


1,260 


1,450 


2,330 


4,740 


5,410 


9,530 


10,900 


• 150 


101 


137 


245 


287 


477 


575 


1,020 


1,180 


1,910 


3,860 


4,430 


7,810 


8,890 


200 


[ 86 


118 


213 


248 


415 


501 


880 


1,020 


1,660 


3,340 


3,840 


6,780 


7,710 


250 


' 77 


105 


191 


222 


373 


448 


785 


910 


1,490 


2,980 


3,440 


6,080 


6,900 


300 


69 


96 


173 


203 


343 


411 


716 


829 


1,360 


2,720 


3,150 


5,560 


6,300 


400 


60 


82 


151 


175 


298 


355 


616 


716 


1,160 


2,350 


2,730 


4,830 


5,460 


500 


53 


72 


135 


158 


268 


319 


550 


638 


1,030 


2,100 


2,450 


4,330 


4,880 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m^/h, 1 degree = 0.01745 rad. 
Notes: 

1 . Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds Vj psi (based on 1 3 in. w.c. outlet pressure), DO NOT USE 
THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate. 

2. CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guid- 
ance. 

3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L = \.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends. 

4. EHD — Equivalent Hydrauhc Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

5. All table entries have been rounded to three significant digits. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.51 



APPENDIX C 





Gas I 


Jndiluted Propane 


TABLE C402.4(32) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure J 


5.0 psi 


Pressure Drop C 


3.5 psi 




Specific Gravity 


.50 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31. 


37 


46 


48 


60 


62 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


826 


1,070 


1,710 


2,060 


3,150 


4,000 


7,830 


8,950 


13,100 


28,600 


31,200 


54,400 


63,800 


25 


509 


664 


1,090 


1,310 


2,040 


2,550 


4,860 


5,600 


8,400 


18,000 


19,900 


34,700 


40,400 


30 


461 


603 


999 


1,190 


1,870 


2,340 


4,430 


5,100 


7,680 


16,400 


18,200 


31,700 


36,900 


40 


396 


520 


867 


1,030 


1,630 


2,030 


3,820 


4,400 


6,680 


14,200 


15,800 


27,600 


32,000 


50 


352 


463 


777 


926 


1,460 


1,820 


3,410 


3,930 


5,990 


12,700 


14,100 


24,700 


28,600 


75 


284 


376 


637 


757 


1,210 


1,490 


2,770 


3,190 


4,920 


10,300 


11,600 


20,300 


23,400 


80 


275 


363 


618 


731 


1,170 


1,450 


2,680 


3,090 


4,770 


9,990 


11,200 


19,600 


22,700 


100 


243 


324 


553 


656 


1,050 


1,300 


2,390 


2,760 


4,280 


8,930 


10,000 


17,600 


20,300 


150 


196 


262 


453 


535 


866 


1,060 


1,940 


2,240 


3,510 


7,270 


8,210 


14,400 


16,600 


200 


169 


226 


393 


464 


755 


923 


1,680 


1,930 


3,050 


6,290 


7,130 


12,500 


14,400 


250 


150 


202 


352 


415 


679 


828 


1,490 


1,730 


2,740 


5,620 


6,390 


11,200 


12,900 


300 


136 


183 


322 


379 


622 


757 


1,360 


1,570 


2,510 


5,120 


5,840 


10,300 


11,700 


400 


117 


158 


279 


328 


542 


657 


1,170 


1,360 


2,180 


4,430 


5,070 


8,920 


10,200 


500 


104 


140 


251 


294 


488 


589 


1,050 


1,210 


1,950 


3,960 


4,540 


8,000 


9,110 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 rn^/h, 1 degree = 0.01745 rad. 
Notes: 

1. Table does not include effect of pressure drop across line regulator. Where regulator loss exceeds 1 psi, DO NOT USE THIS TABLE. Consult with the regulator 
manufacturer for pressure drops and capacity factors. Pressure drop across regulator may vary with the flow rate. 

2. CAUTION: Capacities shown in the table may exceed maximum capacity of selected regulator. Consult with the tubing manufacturer for guidance. 

3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be inci^eased by an equivalent 
length of tubing to the following equation: L = 1 .3n where L is additional length (feet) of tubing and n is the number of addifional fittings and/or bends. 

4. EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

5. All table entries have been rounded to three significant digits. 



117.52 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



TABLE C402.4(33) 
POLYETHYLENE PLASTIC PIPE 




Gas 


Undiluted Propane 


Inlet Pressure 


11.0 in. w.c. 




Pressure Drop 


0.5 in. w.c. 




Specific Gravity 


1.50 


PIPE SIZE (in.) 


Nominal OD 


'/a 


% 


1 


l'/4 


IV2 


2 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


340 


680 


1,230 


2,130 


3,210 


5,770 


20 


233 


468 


844 


1,460 


2,210 


3,970 


30 


187 


375 


677 


1,170 


1,770 


3,180 


40 


160 


321 


580 


1,000 


1,520 


2,730 


50 


142 


285 


514 


890 


1,340 


2,420 


60 


129 


258 


466 


807 


1,220 


2,190 


70 


119 


237 


428 


742 


1,120 


2,010 


80 


110 


221 


398 


690 


1,040 


1,870 


90 


103 


207 


374 


648 


978 


1,760 


100 


98 


196 


353 


612 


924 


1,660 


125 


87 


173 


313 


542 


819 


1,470 


150 


78 


157 


284 


491 


742 


1,330 


175 


72 


145 


261 


452 


683 


1,230 


200 


67 


135 


243 


420 


635 


1,140 


250 


60 


119 


215 


373 


563 


1,010 


300 


54 


108 


195 


338 


510 


916 


350 


50 


99 


179 


311 


469 


843 


400 


46 


92 


167 


289 


436 


784 


450 


43 


87 


157 


271 


409 


736 


500 


41 


82 


148 


256 


387 


695 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, I pound per square inch = 6.895kPa, 1-inch water column = 0.2488 icPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 nr'/h, 1 degree = 0.01745 rad. 
Note: All table entries have been rounded to three significant digits. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.53 



APPENDIX C 





TABLE C402.4(34) 
POLYETHYLENE PLASTIC PIPE 




Gas 


Undiluted Propane 






Inlet Pressure 


2.0 psi 






Pressure Drop 


1.0 psi 






Specific Gravity 


1.50 






PIPE SIZE (in.) 


Nominal OD 


V2 


'U 


1 


IV4 


IV2 


2 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


3,130 


6,260 


11,300 


19,600 


29,500 


53,100 


20 


2,150 


4,300 


7,760 


13,400 


20,300 


36,500 


30 


1,730 


3,450 


6,230 


10,800 


16,300 


29,300 


40 


1,480 


2,960 


5,330 


9,240 


14,000 


25,100 


50 


1,310 


2,620 


4,730 


8,190 


12,400 


22,200 


60 


1,190 


2,370 


4,280 


7,420 


11,200 


20,100 


70 


1,090 


2,180 


3,940 


6,830 


10,300 


18,500 


80 


1,010 


2,030 


3,670 


6,350 


9,590 


17,200 


90 


952 


1,910 


3,440 


5,960 


9,000 


16,200 


100 


899 


1,800 


3,250 


5,630 


8,500 


15,300 


125 


797 


1,600 


2,880 


4,990 


7,530 


13,500 


150 


722 


1,450 


2,610 


4,520 


6,830 


12,300 


175 


664 


1,330 


2,400 


4,160 


6,280 


11,300 


200 


618 


1,240 


2,230 


3,870 


5,840 


10,500 


250 


548 


1,100 


1,980 


3,430 


5,180 


9,300 


300 


496 


994 


1,790 


3,110 


4,690 


8,430 


350 


457 


914 


1,650 


2,860 


4,320 


7,760 


400 


425 


851 


1,530 


2,660 


4,020 


7,220 


450 


399 


798 


1,440 


2,500 


3,770 


6,770 


500 


377 


754 


1,360 


2,360 


3,560 


6,390 


550 


358 


716 


1,290 


2,240 


3,380 


6,070 


600 


341 


683 


1,230 


2,140 


3,220 


5,790 


650 


327 


654 


1,180 


2,040 


3,090 


5,550 


700 


314 


628 


1,130 


1,960 


2,970 


5,330 


750 


302 


605 


1,090 


1,890 


2,860 


5,140 


800 


292 


585 


1,050 


1,830 


2,760 


4,960 


850 


283 


566 


1,020 


1,770 


2,670 


4,800 


900 


274 


549 


990 


1,710 


2,590 


4,650 


950 


266 


533 


961 


1,670 


2,520 


4,520 


1,000 


259 


518 


935 


1,620 


2,450 


4,400 


1,100 


246 


492 


888 


1,540 


2,320 


4,170 


1,200 


234 


470 


847 


1,470 


2,220 


3,980 


1,300 


225 


450 


811 


1,410 


2,120 


3,810 


1,400 


216 


432 


779 


1,350 


2,040 


3,660 


1,500 


208 


416 


751 


1,300 


1,960 


3,530 


1,600 


201 


402 


725 


1,260 


1,900 


3,410 


1,700 


194 


389 


702 


1,220 


1,840 


3,300 


1,800 


188 


377 


680 


1,180 


1,780 


3,200 


1,900 


183 


366 


661 


1,140 


1,730 


3,110 


2,000 


178 


356 


643 


1,110 


1,680 


■3,020 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 

1 British thermal unit per hour = 0.293 

Note: All table entries have been rounded to three si 



1 pound per square inch = 6, 
1 W, 1 cubic foot per hour = 
gnificant digits. 



895 kPa, 1-inch water column = 0.2488 kPa, 
0.0283 m'/h, 1 degree = 0.01745 rad. 



117.54 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



TABLE C402.4(35) 
POLYETHYLENE PLASTIC TUBING 




Gas 


Undiluted Propane 


Inlet Pressure 


11.0 in. w.c. 


Pressure Drop 


0.5 in. w.c. 


Specific Gravity 


1.50 






Plastic Tubing Size (CTS) (in.) 


Nominal OD 


% 


'U 


Designation 


SDR 7.00" 


SDR 11.00 


Actual ID 


0.445 


0.927 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


121 


828 


20 


83 


569 


30 


67 


457 


40 


57 


391 


50 


51 


347 


60 


46 


314 


70 


42 


289 


80 


39 


269 


90 


37 


252 


100 


35 


238 


125 


31 


211 


150 


28 


191 


175 


26 


176 


200 


24 


164 


225 


22 


154 


250 


21 


145 


275 


20 


138 


300 


19 


132 


350 


18 


121 


400 


16 


113 


450 


15 


106 


500 


15 


100 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 

1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.293 1 W, 1 cubic foot per hour = 0.0283 ml\\, 

1 degree = 0.01745 rad. 



SECTION C403 
PIPING MATERIALS 

C403.1 General. Materials used for piping systems shall com- 
ply with the requirements of this chapter or shall be approved. 

C403.2 Used materials. Pipe, fittings, valves and other materi- 
als shall not be used again except where they are free of foreign 
materials and have been ascertained to be adequate for the ser- 
vice intended. 



C403.3 Metallic pipe. Metallic pipe shall comply with Sec- 
tions C403.3.1 through C403.3.4. 

C403.3.1 Cast iron. Cast-iron pipe shall not be used. 

C403.3.2 Steel. Steel and wrought-iron pipe shall be at least 
of standard weight (Schedule 40) and shall comply with one 
of the following standards: 

1. ASME B 36.10, lOM; 

2. ASTM A 53; or 

3. ASTM A 106. 

C403.3.3 Copper and brass. Copper and brass pipe shall 
not be used if the gas contains more than an average of 0.3 
grains of hydrogen sulfide per 100 standard cubic feet of gas 
(0.7 milligrams per 100 liters). Threaded copper, brass and 
aluminum-alloy pipe shall not be used with gases corrosive 
to such materials. 

C403.3.4 Aluminum. Aluminum-alloy pipe shall comply 
with ASTM B 241 (except that the use of alloy 5456 is prohib- 
ited), and shall be marked at each end of each length indicating 
compliance. Aluminum-alloy pipe shall be coated to protect 
against external corrosion where it is in contact with masonry, 
plaster, or insulation, or is subject to repeated wettings by such 
liquids as water, detergents, or sewage. Aluminum-alloy pipe 
shall not be used in exterior locations or underground. 

C403.4 Metallic tubing. Seamless copper, aluminum alloy 
and steel tubing shall not be used with gases corrosive to such 
materials, 

C403.4.1 Steel tubing. Steel tubing shall comply with 
ASTM A 254 or ASTM A 539. 

C403.4.2 Copper and brass tubing. Copper tubing shall 
comply with Standard Type K or L of ASTM B 88 or ASTM 
B 280. 

Copper and brass tubing shall not be used if the gas con- 
tains more than an average of 0.3 grains of hydrogen sulfide 
per 100 standard cubic feet of gas (0.7 milligrams per 100 

liters). 

C403.4.3 Aluminum tubing. Aluminum-alloy tubing shall 
comply with ASTM B 210 or ASTM B 241. Alumi- 
num-alloy tubing shall be coated to protect against external 
corrosion where it is in contact with masonry, plaster or 
insulation, or is subject to repeated wettings by such liquids 
as water, detergent or sewage. 

Aluminum-alloy tubing shall not be used in exterior loca- 
tions or underground. 

C403.4.4 Corrugated stainless steel tubing. Corrugated 
stainless steel tubing shall be listed in accordance with 
ANSI LC 1/CSA 6.26. 

C403.5 Plastic pipe, tubing and fittings. Plastic pipe, tubing 
and fittings used to supply fuel gas shall be used outdoors, 
underground, only, and shall conform to ASTM D 2513. Pipe 
shall be marked "Gas" and "ASTM D 2513." 

C403.5.1 Anodeless risers. Plastic pipe, tubing and 
anodeless risers shall comply with the following: 

1. Factory-assembled anodeless risers shall be recom- 
mended by the manufacturer for the gas used and 



< 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.55 



APPENDIX C 



shall be leak tested by the manufacturer in accordance 
with written procedures. 

2. Service head adapters and field-assembled anodeless 
risers incorporating service head adapters shall be 
recommended by the manufacturer for the gas used, 
and shall be designed and certified to meet the 
requirements of Category I of ASTM D 2513, and 
U.S. Department of Transportation, Code of Federal 
Regulations, Title 49, Part 192.281(e). The manufac- 
turer shall provide the user with qualified installation 
instructions as prescribed by the U.S. Department of 
Transportation, Code of Federal Regulations, Title 
49, Part 192.283(b). 



TABLE C403.8.2 
SPECIFICATIONS FOR THREADING METALLIC PIPE 



.2 LP-gas systems. The use of plastic pipe, tubing 
and fittings in undiluted liquefied petroleum gas piping sys- 
tems shall be in accordance with NFPA 58. 



L53 Regulator vent piping. Plastic pipe, tubing and 
fittings used to connect regulator vents to remote vent termi- 
nations shall be PVC conforming to UL 65 1 . PVC vent pip- 
ing shall not be installed indoors. 

C4(D>3.6 Workmanship and defects. Pipe, tubing and fittings 
shall be clear and free from cutting burrs and defects in struc- 
ture or threading, and shall be thoroughly brushed, and chip 
and scale blown. 

Defects in pipe, tubing and fittings shall not be repaired. 
Defective pipe, tubing and fittings shall be replaced (see Sec- 
tion C406. 1.2). 

C403,7 Protective coating. Where in contact with material or 
atmosphere exerting a corrosive action, metallic piping and fit- 
tings coated with a corrosion-resistant material shall be used. 
External or internal coatings or linings used on piping or com- 
ponents shall not be considered as adding strength. 

C403.8 Metallic pipe threads. Metallic pipe and fitting threads 
shall be taper pipe threads and shall comply with ASME B 1 .20. 1 . 



L8.1 Damaged threads. Pipe with threads that are 
stripped, chipped, corroded or otherwise damaged shall not 
be used. Where a weld opens during the operation of cutting 
or threading, that portion of the pipe shall not be used. 

C403.8.2 Number of threads. Field threading of metallic 
pipe shall be in accordance with Table C403.8.2. 



IM3 Thread compounds. Thread (joint) compounds 
(pipe dope) shall be resistant to the action of liquefied petro- 
leum gas or to any other chemical constituents of the gases 
to be conducted through the piping. 



I Metallic piping joints and fittings. The type of piping 
joint used shall be suitable for the pressure-temperature condi- 
tions and shall be selected giving consideration to joint tight- 
ness and mechanical strength under the service conditions. The 
joint shall be able to sustain the maximum end force caused by 
the internal pressure and any additional forces caused by tem- 
perature expansion or contraction, vibration, fatigue or the 
weight of the pipe and its contents. 



IRON PIPE SIZE 
(inches) 


APPROXIMATE LENGTH OF 
THREADED PORTION (inches) 


APPROXIMATE NUMBER 
OF THREADS TO BE CUT 


% 


'U 


10 


'U 


% 


10 


1 


% 


10 


1V4 


1 


u 


iv. 


1 


u 


2 


1 


11 


2% 


1% 


12 


3 


\% 


12 


4 


1% 


13 



For SL- 1 inch = 25.4 mm. 

C403.9.1 Pipe joints. Pipe joints shall be threaded, flanged, 
brazed or welded. Where nonferrous pipe is brazed, the 
brazing materials shall have a melting point in excess of 
1,000°F (538°C). Brazing alloys shall not contain more than 
0.05-percent phosphorus. 

C403.9.2 Tiibing joints. Tubing joints shall be either made 
with approved gas tubing fittings or brazed with a material 
having a melting point in excess of 1,000°F (538°C). Brazing 
alloys shall not contain more than 0.05-percent phosphorus. 

C403.9.3 Flared joints. Flared joints shall be used only in 
systems constructed from nonferrous pipe and tubing where 
experience or tests have demonstrated that the joint is suit- 
able for the conditions and where provisions are made in the 
design to prevent separation of the joints. 

C403.9.4 Metallic fittings. MetalUc fittings shall comply 
with the following: 

1. Threaded fittings in sizes larger than 4 inches (102 
mm) shall not be used except where approved. 

2. Fittings used with steel or wrought-iron pipe shall be 
steel, brass, bronze, malleable iron or cast iron. 

3. Fittings used with copper or brass pipe shall be cop- 
per, brass or bronze. 

4. Fittings used with aluminum- alloy pipe shall be of 
aluminum alloy. 

5. Cast-iron fittings: 

5.1. Ranges shall be permitted. 

5.2. Bushings shall not be used. 

5.3. Fittings shall not be used in systems contain- 
ing flammable gas-air mixtures. 

5.4. Fittings in sizes 4 inches (102 mm) and larger 
shall not be used indoors except where ap- 
proved. 

5.5. Fittings in sizes 6 inches (152 mm) and larger 
shall not be used except where approved. 



117.56 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



6. Aluminum-alloy fittings.! Threads shall not form the 
joint seal. 

7. Zinc aluminum-alloy fittings. Fittings shall not be 
used in systems containing flammable gas-air mix- 
tures. 

8. Special fittings. Fittings such as couplings, propri- 
etary-type joints, saddle tees, gland-type compres- 
sion fittings, and flared, flareless or compression-type 
tubing fittings shall be: used within the fitting manu- 
facturer's pressure-temperature recommendations; 
used within the service conditions anticipated with 
respect to vibration, fatigue, thermal expansion or 
contraction; installed or braced to prevent separation 
of the joint by gas pressure or external physical dam- 
age; and shall be approved. 

C403.10 Plastic pipe, joints and fittings. Plastic pipe, tubing 
and fittings shall be joined in accordance with the manufac- 
turer's instructions. Such joint shall comply with the following: 

1 . The joint shall be designed and installed so that the longi- 
tudinal pull-out resistance of the joint will be at least 
equal to the tensile strength of the plastic piping material. 

2. Heat-fusion joints shall be made in accordance with 
qualified procedures that have been established and 
proven by test to produce gas-tight joints at least as 
strong as the pipe or tubing being joined. Joints shall be 
made with the joining method recommended by the pipe 
manufacturer. Heat fusion fittings shall be marked 
"ASTMD2513." 

3. Where compression-type mechanical joints are used, the 
gasket material in the fitting shall be compatible with the 
plastic piping and with the gas distributed by the system. 
An internal tubular rigid stiffener shall be used in con- 
junction with the fitting. The stiffener shall be flush with 
the end of the pipe or tubing and shall extend at least to 
the outside end of the compression fitting when installed. 
The stiffener shall be free of rough or sharp edges and 
shall not be a force fit in the plastic. Split tubular stiffen- 
ers shall not be used. 

4. Plastic piping joints and fittings for use in liquefied 
petroleum gas piping systems shall be in accordance 
with NFPA 58. 

C403.ll Flanges. All flanges shall comply with ASME B 1 6. 1 , 
ASME B 16.20 or MSS SP-6. The pressure-temperature ratings 
shall equal or exceed that required by the application. 

C403.11.1 Flange facings. Standard facings shall be per- 
mitted for use under this code. Where 150-pound (1034 
kPa) pressure-rated steel flanges are bolted to Class 125 
cast-iron flanges, the raised face on the steel flange shall be 
removed. 

C403.11.2 Lapped flanges. Lapped flanges shall be used 
only above ground or in exposed locations accessible for 
inspection. 

C403.12 Flange gaskets. Material for gaskets shall be capable 
of withstanding the design temperature and pressure of the pip- 
ing system, and the chemical constituents of the gas being con- 
ducted, without change to its chemical and physical properties. 



The effects of fire exposure to the joint shall be considered in 
choosing material. Acceptable materials include metal or 
metal-jacketed asbestos (plain or corrugated), asbestos, and 
aluminum "O" rings and spiral wound metal gaskets. When a 
flanged joint is opened, the gasket shall be replaced. Full-face 
gaskets shall be used with all bronze and cast-iron flanges. 



SECTION C404 
PIPING SYSTEM INSTALLATION 

C404.1 Prohibited locations. Piping shall not be installed in 
or through a circulating air duct, clothes chute, chimney or gas 
vent, ventilating duct, dumbwaiter or elevator shaft. Piping 
installed downstream of the point of delivery shall not extend 
through any townhouse unit other than the unit served by such 
piping. 

C404.2 Piping in solid partitions and walls. Concealed pip- 
ing shall not be located in solid partitions and solid walls, 
unless installed in a chase or casing. 

C404.3 Piping in concealed locations. Portions of a piping 
system installed in concealed locations shall not have unions, 
tubing fittings, right and left couplings, bushings, compression 
couplings and swing joints made by combinations of fittings. 

Exceptions: 

1. Tubingjoined by brazing. 

2. Fittings listed for use in concealed locations. 

C404.4 Piping through foundation wall. Underground pip- 
ing, where installed below grade through the outer foundation 
or basement wall of a building, shall be encased in a protective 
pipe sleeve. The annular space between the gas piping and the 
sleeve shall be sealed. 

C404.5 Protection against physical damage. In concealed 
locations, where piping other than black or galvanized steel is 
installed through holes or notches in wood studs, joists, rafters 
or similar members less than 1.5 inches (38 mm) from the 
nearest edge of the member, the pipe shall be protected by 
shield plates. Shield plates shall be a minimum of 
Vi6-inch-thick (1.6 mm) steel, shall cover the area of the pipe 
where the member is notched or bored and shall extend a mini- 
mum of 2 inches (51 mm) above sole plates, below top plates 
and to each side of a stud, joist or rafter. 

C404.6 Piping in solid floors. Piping in solid floors shall be 
laid in channels in the floor and covered in a manner that will 
allow access to the piping with a minimum amount of damage 
to the building. Where such piping is subject to exposure to 
excessive moisture or corrosive substances, the piping shall be 
protected in an approved manner. As an alternative to installa- 
tion in channels, the piping shall be installed in a conduit of 
Schedule 40 steel, wrought iron, PVC or ABS pipe with tightly 
sealed ends and joints. Both ends of such conduit shall extend 
not less than 2 inches (5 1 mm) beyond the point where the pipe 
emerges from the floor. The conduit shall be vented above 
grade to the outdoors and shall be installed so as to prevent the 
entry of water and insects. 

C404.7 Above-ground outdoor piping. All piping installed 
outdoors shall be elevated not less than VI2 inches (152 mm) 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.57 



APPENDIX C 



> 



above ground and where installed across roof surfaces, shall be 
elevated not less than 3 Vj inches (152 mm) above the roof sur- 
face. Piping installed above ground, outdoors, and installed 
across the surface of roofs shall be securely supported and 
located where it will be protected from physical damage. 
Where passing through an outside wall, the piping shall also be 
protected against corrosion by coating or wrapping with an 
inert material. Where piping is encased in a protective pipe 
sleeve, the annular space between the piping and the sleeve 
shall be sealed. 

€404.8 Corrosiom and covering protection. Nonmetallic gas 
piping and coated and cathodically protected piping shall have 
a minimum of 18 inches (457 mm) of earth cover or other 
equivalent protection. Risers, including prefabricated risers 
inserted with plastic pipe, shall be metallic and shall be pro- 
tected in an approved manner to a point at least 6 inches (153 
mm) above grade. When a riser connects to plastic pipe under- 
ground, the horizontal metallic portion underground shall be at 
least 30 inches (762 mm) in length before connecting to the 
plastic service pipe. An approved transition fitting or adapter 
shall be used where the plastic joins the metallic riser. 

Ferrous metals in exposed exterior locations shall be pro- 
tected from corrosion in a manner approved by the building 
official after consulting with the gas supplier. 

Ferrous pipes installed underground shall not be placed in 
contact with other metallic objects such as pipes or wires. 

Zinc coatings (galvanizing) shall not be deemed adequate 
protection for piping below grade. Ferrous gas piping installed 
underground in exterior locations shall be protected from cor- 
rosion by one of the following methods: 

C404.8.1 Coated and cathodically protected pipe. All gas 
pipe protective coatings shall be approved types, machine 
applied and conform to recognized standards. Field wrap- 
ping shall provide equivalent protection and is restricted to 
those short sections and fittings necessarily stripped for 
threading or welding. Underground coated and wrapped gas 
piping shall be cathodically protected with galvanic anodes 
or rectifiers and electrically isolated from the rest of the sys- 
tem by insulating unions 6 inches (153 mm) above grade. 

C404.8,2 Unwrapped (toare) pipe and special covering. 
Unwrapped ferrous gas piping being installed underground 
in exterior locations shall be protected from corrosion by 
being installed within a minimum 6-inch (153 mm) protec- 
tive bed of sand around the gas piping, the pipe being cen- 
trally located within the sand backfill, and all such 
horizontal piping shall have a minimum of 18 inches (457 
mm) of earth cover or other equivalent protection. Under- 
ground piping shall be electrically isolated from the rest of 
the system by insulating unions placed a minimum of 6 
inches (153 mm) above grade. 

€404.8.3 Electrical isolation of fuel gas piping. Under- 
ground ferrous gas piping shall be electrically isolated from 
the rest of the gas system with listed or approved isolation 
fittings installed a minimum of 6 inches (153 mm) above 
grade. 



C404.9 Minimum burial depth. Underground piping systems 
shall be installed a minimum depth of 12 inches (305 mm) 
below grade, except as provided for in Section C404.9.1 . 

C404.9.1 Individual outside appliances. Individual lines 
to outside lights, grills or other appliances shall be installed 
a minimum of 8 inches (203 mm) below finished grade, pro- 
vided that such installation is approved and is installed in 
locations not susceptible to physical damage. 



0) Trenches. The trench shall be graded so that the pipe 
has a firm, substantially continuous bearing on the bottom of 
the trench. 



[).l Underground gas pipe separation. Under- 
ground gas piping shall be separated vertically or horizon- 
tally from other underground piping as follows: 

1. Sewer pipe^ — not less than 18 inches (457 mm) from 
any underground sewer line. 

2. Water pipe — not less than 12 inches (305 mm) from 
any underground water line. 

3. Drainage pipe — not less than 12 inches (305 mm) 
from any underground drainage line. 

C404.ll Piping underground beneath buildings. Piping 
installed underground beneath buildings is prohibited except 
where the piping is encased in a conduit of wrought iron, plas- 
tic pipe, or steel pipe designed to withstand the superimposed 
loads. Such conduit shall extend into an occupiable portion of 
the building and, at the point where the conduit terminates in 
the building, the space between the conduit and the gas piping 
shall be sealed to prevent the possible entrance of any gas leak- 
age. Where the end sealing is capable of withstanding the full 
pressure of the gas pipe, the conduit shall be designed for the 
same pressure as the pipe. Such conduit shall extend not less 
than 4 inches (102 mm) outside the building, shall be vented 
above grade to the outdoors, and shall be installed so as to pre- 
vent the entrance of water and insects. The conduit shall be pro- 
tected from corrosion in accordance with Section C404.8. 

C404.12 Outlet closures. Gas outlets that do not connect to 
appliances shall be capped gas tight. 

Exception: Listed and labeled flush-mounted- type quick- 
disconnect devices and Msted and labeled gas convenience 
outlets shall be installed in accordance with the manufac- 
turer's installation instructions. 

C404.13 Location of outlets. The unthreaded portion of pip- 
ing outlets shall extend not less than 1 inch (25 mm) through fin- 
ished ceilings and walls and where extending through floors or 
outdoor patios and slabs, shall not be less than 2 inches (51 
mm) above them. The outlet fitting or piping shall be securely 
supported. Outlets shall not be placed behind doors. Outlets 
shall be located in the room or space where the appliance is 
installed. 

Exception: Listed and labeled flush-mounted-type quick- 
disconnect devices and listed and labeled gas convenience 
outlets shall be installed in accordance with the manufac- 
turer's installation instructions. 

C404.14 Plastic pipe. The installation of plastic pipe shall 
comply with Sections C404.14.1 through C404.14.3. 



117.58 



2007 OREGON MECHANICAL SPECBALTY CODE 



APPENDIX C 



C404,14.1 Limitations. Plastic pipe shall be installed out- 
side underground only. Plastic pipe shall not be used within 
or under any building or slab or be operated at pressures 
greater than 100 psig (689 kPa) for natural gas or 30 psig 
(207 kPa) for LP-gas. 

Exceptions; 

1 . Plastic pipe shall be permitted to terminate above 
ground outside of buildings where installed in 
premanufactured anodeless risers or service head 
adapter risers that are installed in accordance with 
the manufacturer's installation instructions. 

2. Plastic pipe shall be permitted to terminate with a 
wall head adapter within buildings where the plas- 
tic pipe is inserted in a piping material for fuel gas 
use in buildings. 

3 . Plastic pipe shall be permitted to be installed under 
outdoor patios, walkways and driveways. 

C404.14.2 Connections. Connections made outside and 
underground between metallic and plastic piping shall be 
made only with transition fittings categorized as Category I 
in accordance with ASTM D 25 1 3 . 



13 Tracer. A yellow insulated copper tracer wire or 
other approved conductor shall be installed adjacent tp 
underground nonmetallic piping. Access shall be provided 
to the tracer wire or the tracer wire shall terminate above 
ground at each end of the nonmetallic piping. The tracer 
wire size shall not be less than 18 AWG and the insulation 
type shall be suitable for direct burial. 



.15 Prohibited devices. A device shall not be placed 
inside the piping or fittings that will reduce the cross-sectional 
area or otherwise obstruct the free flow of gas. 

Exception: Approved gas filters. 

C404.16 Testing of piping. Before any system of piping is put 
in service or concealed, it shall be tested to ensure that it is gas 
tight. Testing, inspection and purging of piping systems shall 
comply with Section C406. 



SECTION C405 
PIPING BENDS AND CHANGES IN DIRECTION 

C405.1 General. Changes in direction of pipe shall be permit- 
ted to be made by the use of fittings, factory bends, or field 
bends. 

C405.2 Metallic pipe. Metallic pipe bends shall comply with 
the following: 

1. Bends shall be made only with bending tools and proce- 
dures intended for that purpose. 

2. All bends shall be smooth and free from buckling, cracks 
or other evidence of mechanical damage. 

3 . The longitudinal weld of the pipe shall be near the neutral 
axis of the bend. 

4. Pipe shall not be bent through an arc of more than 90 
degrees (1.6 rad). 



5. The inside radius of a bend shall be not less than six times 
the outside diameter of the pipe. 

C405.3 Plastic pipe. Plastic pipe bends shall comply with the 
following: 

1 . The pipe shall not be damaged and the internal diameter 
of the pipe shall not be effectively reduced. 

2. Joints shall not be located in pipe bends. 

3. The radius of the inner curve of such bends shall not be 
less than 25 times the inside diameter of the pipe. 

4. Where the piping manufacturer specifies the use of 
special bending tools or procedures, such tools or proce- 
dures shall be used. 

C405.4 Elbows. Factory-made welding elbows or transverse 
segments cut therefrom shall have an arc length measured 
along the crotch at least 1 inch (25 mm) in pipe sizes 2 inches 
(51 mm) and larger. 



SECTION C406 
INSPECTION, TESTING AND PURGING 

C406.1 General. Prior to acceptance and initial operation, all 
piping installations shall be inspected and pressure tested to 
determine that the materials, design, fabrication, and installa- 
tion practices comply with the requirements of this code. 

C406.1.1 Inspections. Inspection shall consist of visual 
examination, during or after manufacture, fabrication, 
assembly, or pressure tests as appropriate. Supplementary 
types of nondestructive inspection techniques, such as mag- 
netic-particle, radiographic, ultrasonic, etc., shall not be 
required unless specifically listed herein or in the engineer- 
ing design. 

C406.1.1.1 Rough piping inspection. This inspection 
shall be made after piping authorized by the permit has 
been installed and before such piping has been covered 
or concealed or a fixture or appliance has been attached 
thereto. This inspection shall include a determination 
that the gas piping size, material and installation meet the 
requirements of this appendix. 

C406.1.1.2 Final piping inspection. This inspection 
shall be made after piping authorized by the permit has 
been installed and after all portions thereof which are to 
be covered or concealed are so concealed and after fix- 
tures, appliances or shutoff valves have been attached 
thereto. 

C406.1.2 Repairs and additions. In the event repairs or 
additions are made after the pressure test, the affected pip- 
ing shall be tested. 

Minor repairs and additions are not required to be pres- 
sure tested provided that the work is inspected and connec- 
tions are tested with a noncorrosive leak-detecting fluid or 
other approved leak-detecting methods. 

C406.1.3 New branches. Where new branches are installed 
to new appliances, only the newly installed branches shall 
be required to be pressure tested. Connections between the 
new piping and the existing piping shall be tested with a 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.59 



APPENDIX C 



noncorrosive leak-detecting fluid or other approved 
leak-detecting methods. 

C406.1.4 SectHom testing. A piping system shall be permitted 
to be tested as a complete unit or in sections. Under no cir- 
cumstances shall a valve in a line be used as a bulkhead 
between gas in one section of the piping system and test 
medium in an adjacent section, unless two valves are installed 
in series with a valved "telltale" located between these valves. 
A valve shall not be subjected to the test pressure unless it can 
be determined that the valve, including the valve-closing 
mechanism, is designed to safely withstand the test pressure. 



.1.5 Regulators aiid valve assemblies. Regulator and 
valve assemblies fabricated independently of the piping 
system in which they are to be installed shall be permitted to 
be tested with inert gas or air at the time of fabrication. 



.2 Test medium. The test medium shall be air, nitrogen, 
carbon dioxide or an inert gas. Oxygen shall not be used. 

€406.3 Test preparation. Pipe joints, including welds, shall 
be left exposed for examination during the test. 

Exceptioim: Covered or concealed pipe end joints that have 
been previously tested in accordance with this appendix. 

C4(06.3.1 Expansion joints. Expansion joints shall be pro- 
vided with temporary restraints, if required, for the addi- 
tional thrust load under test. 

€406.3,2 Appliance and equipment isolation. Appliances 
and equipment that are not to be included in the test shall be 
either disconnected from the piping or isolated by blanks, 
blind flanges, or caps. Flanged joints at which blinds are 
inserted to blank off other equipment during the test shall 
not be required to be tested. 

€406.3.3 Appliance and equipment disconnection. Where 
the piping system is connected to appliances or equipment 
designed for operating pressures of less than the test pressure, 
such appliances or equipment shall be isolated from the pip- 
ing system by disconnecting them and capping the outlet(s). 



j.3.4 Valve isolation. Where the piping system is con- 
nected to appliances or equipment designed for operating 
pressures equal to or greater than the test pressure, such 
appliances or equipment shall be isolated from the piping 
system by closing the individual appliance or equipment 
shutoff valve(s). 



p.3.5 Testing precautions. All testing of piping sys- 
tems shall be done with due regard for the safety of employ- 
ees and the public during the test. Bulkheads, anchorage, 
and bracing suitably designed to resist test pressures shall be 
installed if necessary. Prior to testing, the interior of the pipe 
shall be cleared of all foreign material. 



J.4 Test pressure measurement. Test pressure shall be 
measured with a manometer or with a pressure-measuring 
device designed and calibrated to read, record, or indicate a 
pressure loss caused by leakage during the pressure test period. 
The source of pressure shall be isolated before the pressure 
tests are made. Mechanical gauges used to measure test pres- 
sures shall have a range such that the highest end of the scale is 
not greater than five times the test pressure. 



C406.4.1 Test pressure. Gas piping systems under 14 
inches (3.5 kPa) water column pressure, shall be tested at a 
pressure of not less than 10 psi (69 kPa) gauge pressure. Test 
pressures shall be held for not less than 15 minutes with no 
perceptible drop in pressure. For welded piping, and for pip- 
ing CEirrying gas at pressures exceeding 14 inches water col- 
umn (3484 Pa) pressure, the test pressure shall be at least 60 
psi (0.0422 kg/mm^) for not less than 30 minutes. 

Exception: Testing, inspection and purging of gas pip- 
ing systems performed by using NFPA 54 shall be per- 
mitted. 



SECTION C407 
PIPING SUPPORT 

C407.1 General. Piping shall be provided with support in 
accordance with Section C407.2. 

C407.2 Design and installation. Piping shall be supported 
with pipe hooks, metal pipe straps, bands, brackets, or hangers 
suitable for the size of piping, of adequate strength and quality, 
and located at intervals so as to prevent or damp out excessive 
vibration. Piping shall be anchored to prevent undue strains on 
connected equipment and shall not be supported by other pip- 
ing. Pipe hangers and supports shall conform to the require- 
ments of MSS SP-58 and shall be spaced in accordance with 
Section C415. Supports, hangers, and anchors shall be 
installed so as not to interfere with the free expansion and con- 
traction of the piping between anchors. All parts of the support- 
ing equipment shall be designed and installed so they will not 
be disengaged by movement of the supported piping. 



SECTION C408 
DRIPS AND SLOPED PIPING 

C408.1 Slopes. Piping for other than dry gas conditions shall 
be sloped not less than V4 inch in 15 feet (6.3 mm in 4572 mm) 
to prevent traps. 

C408.2 Drips. Where wet gas exists, a drip shall be provided at 
any point in the line of pipe where condensate could collect. A 
drip shall also be provided at the outlet of the meter and shall be 
installed so as to constitute a trap wherein an accumulation of 
condensate will shut off the flow of gas before the condensate 
will run back into the meter. 

C408,3 Location of drips. Drips shall be provided with ready 
access to permit cleaning or emptying. A drip shall not be 
located where the condensate is subject to freezing. 

C408.4 Sediment trap. Where a sediment trap is not incorpo- 
rated as part of the gas utilization equipment, a sediment trap 
shall be installed downstream of the equipment shutoff valve as 
close to the inlet of the equipment as practical. The sediment 
trap shall be either a tee fitting with a capped nipple in the bot- 
tom opening of the run of the tee or other device approved as an 
effective sediment trap. Illuminating appliances, ranges, 
clothes dryers and outdoor grills need not be so equipped. 



< 



117.60 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



SECTION C409 
SHUTOFF VALVES 

C409.1 General. Piping systems shall be provided with shut- 
off valves in accordance with this section. 

C409.1.1 Valve approval. Shutoff valves shall be of an 
approved type; shall be constructed of materials compatible 
with the piping; and shall comply with the standard that is 
applicable for the pressure and application, in accordance 
with Table C409. 1.1. 

C409.1.2 Prohibited locations. Shutoff valves shall be pro- 
hibited in concealed locations and furnace plenums. 

C409.1.3 Access to shutoff valves. Shutoff valves shall be 
located in places so as to provide access for operation and 
shall be installed so as to be protected from damage. 

C409.2 Meter valve. Every meter shall be equipped with a 
shutoff valve located on the supply side of the meter. 

C409.3 Shutoff valves for multiple-house line systems. 

Where a single meter is used to supply gas to more than one 
building or tenant, a separate shutoff valve shall be provided for 
each building or tenant. 

C409.3.1 Multiple tenant buildings. In multiple tenant 
buildings, where a common piping system is installed to 
supply other than one- and two-family dwellings, shutoff 
valves shall be provided for each tenant. Each tenant shall 
have access to the shutoff valve serving that tenant's space. 

C409.3.2 Individual buildings. In a common system serv- 
ing more than one building, shutoff valves shall be installed 
outdoors at each building. 

C409.3.3 Identification of shutoff valves. Each house line 
shutoff valve shall be plainly marked with an identification 
tag attached by the installer so that the piping systems sup- 
plied by such valves are readily identified. 

C409.4 MP Regulator valves. A listed shutoff valve shall be 
installed immediately ahead of each MP regulator. 

C409.5 Equipment shutoff valve. Each appliance shall be 
provided with a shutoff valve separate from the appliance. The 
shutoff valve shall be located in the same room as the appli- 
ance, not further than 6 feet (1829 mm) from the appliance, and 
shall be installed upstream from the union, connector or quick 
disconnect device it serves. Such shutoff valves shall be pro- 
vided with access. 



Exception: Shutoff valves for vented decorative appliances 
and decorative appliances for installation in vented fire- 
places shall not be prohibited from being installed in an area 
remote from the appliance where such valves are provided 
with ready access. Such valves shall be permanently identi- 
fied and shall serve no other equipment. Piping from the 
shutoff valve to within 3 feet (914 mm) of the appliance con- 
nection shall be sized in accordance with Section C402. 

C409.5.1 Shutoff valve in fireplace. Equipment shutoff 
valves located in the firebox of a fireplace shall be installed 
in accordance with the appliance manufacturer's instruc- 
tions. 



SECTION C410 
FLOW CONTROLS 

C410.1 Pressure regulators. A line pressure regulator shall be 
installed where the appliance is designed to operate at a lower 
pressure than the supply pressure. Line gas pressure regulators 
shall be listed as complying with ANSI Z21 .80. Access shall be 
provided to pressure regulators. Pressure regulators shall be 
protected from physical damage. Regulators installed on the 
exterior of the building shall be approved for outdoor installa- 
tion. 

C410.2 MP regulators. MP pressure regulators shall comply 
with the following: 

1 . The MP regulator shall be approved and shall be suitable 
for the inlet and outlet gas pressures for the application. 

2. The MP regulator shall maintain a reduced outlet pres- 
sure under lockup (no-flow) conditions. 

3. The capacity of the MP regulator, determined by pub- 
lished ratings of its manufacturer, shall be adequate to 
supply the appliances served. 

4. The MP pressure regulator shall be provided with access. 
Where located indoors, the regulator shall be vented to 
the outdoors or shall be equipped with a leak-limiting 
device, in either case complying with Section C410.3. 

5 . A tee fitting with one opening capped or plugged shall be 
installed between the MP regulator and its upstream 
shutoff valve. Such tee fitting shall be positioned to 
allow connection of a pressure-measuring instrument 
and to serve as a sediment trap. 



TABLE C409.1.1 
MANUAL GAS VALVE STANDARDS 



VALVE STANDARDS 


APPLIANCE SHUTOFF 

VALVE APPLICATION UP 

TO Vz psig PRESSURE 


OTHER VALVE APPLICATIONS 


UP TO Vz psig 
PRESSURE 


UP TO 2 psig 
PRESSURE 


UP TO 5 psig 
PRESSURE 


UP TO 125 psig 
PRESSURE 


ANSIZ21.15 


X 














CSA Requirement 3-88 


X 


X 


X^ 


x" 





ASMEB 16.44 


X 


X 


x^ 


x" 





ASMEB 16.33 


X 


X 


X 


X 


X 



For SI: 1 pound per square inch gauge = 6.895 kPa. 

a. If labeled 2G. 

b. If labeled 5G. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.61 



APPENDIX C 



6. A tee fitting with one opening capped or plugged shall be 
installed not less than 10 pipe diameters downstream of 
the MP regulator outlet. Such tee fitting shall be posi- 
tioned to allow connection of a pressure-measuring 
instrument. 

C410.3 Venting of regulators. Pressure regulators that require 
a vent shall be vented directly to the outdoors. The vent shall be 
designed to prevent the entry of insects, water and foreign 
objects. 

Exception: A vent to the outdoors is not required for regula- 
tors equipped with and labeled for utilization with an 
approved vent-limiting device installed in accordance with 
the manufacturer's instructions. 

C410.3.1 Vent piping. Vent piping shall be not smaller than 
the vent connection on the pressure regulating device. Vent 
piping serving relief vents and combination relief and 
breather vents shall be run independently to the outdoors 
> and shall serve only a single device vent. 



SECTION C41 1 

APPLIANCE AND MANUFACTURED 

HOME CONNECTIONS 

C411.1 Connecting appliances. Except as required by 
Section C411.1.1, appliances shall be connected to the piping 
system by one of the following: 

1. Rigid metallic pipe and fittings. 

2. Corrugated stainless steel tubing (CSST) where installed 
in accordance with the manufacturer's instructions. 

3. Semirigid metallic tubing and metallic fittings. Lengths 
shall not exceed 6 feet (1829 mm) and shall be located 
entirely in the same room as the appliance. Semirigid 
metallic tubing shall not enter a motor-operated appli- 
ance through an unprotected knockout opening. 

4. Listed and labeled appliance connectors in compliance 
with ANSI Z21.24 and installed in accordance with the 
manufacturer's installation instructions and located 
entirely in the same room as the appliance. 

5 . Listed and labeled quick-disconnect devices used in con- 
junction with listed and labeled appliance connectors. 

6. Listed and labeled convenience outlets used in conjunc- 
tion with listed and labeled appliance connectors. 

7. Listed and labeled appliance connectors complying with 
ANSI Z21.69 and listed for use with food service equip- 
ment having casters, or that is otherwise subject to move- 
ment for cleaning, and other large movable equipment. 

8. Listed and labeled outdoor appliance connectors in 
compliance with ANSI Z21.75/CSA 6.27 and installed 
in accordance with the manufacturer's installation 
instructions. 

C411.1.1 Commercial cooking appliances. Commercial 
cooking appliances that are moved for cleaning and sanita- 
tion purposes shall be connected to the piping system with 
an appliance connector listed as complying with ANSI 
Z21.69. 



C411.1.2 Protection against damage. Connectors and 
tubing shall be installed so as to be protected against physi- 
cal damage. 

C411.1.3 Connector installation. Appliance fuel connec- 
tors shall be installed in accordance with the manufacturer's 
instructions and Sections C41 1.1.3.1 through C41 1.1.3.4. 

C411.1.3.1 Maximum length. Connectors shall have an 
overall length not to exceed 3 feet (914 mm), except for 
range and domestic clothes dryer connectors, which 
shall not exceed 6 feet (1829 mm) in overall length. Mea- 
surement shall be made along the centerline of the con- 
nector. Only one connector shall be used for each 
appliance. 

Exception: Rigid metallic piping used to connect an 
appliance to the piping system shall be permitted to 
have a total length greater than 3 feet (914 mm), pro- 
vided that the connecting pipe is sized as part of the 
piping system in accordance with Section C402 and 
the location of the equipment shutoff valve complies 
with Section C409.5. 

C411.1,3.2 Minimum size. Connectors shall have the 
capacity for the total demand of the connected appliance. 



L.3.3 Prohibited locations and penetrations. 
Connectors shall not be concealed within, or extended 
through, walls, floors, partitions, ceilings or appliance 
housings. 

Exception: Fireplace inserts that are factory 
equipped with grommets, sleeves or other means of 
protection in accordance with the listing of the appli- 
ance. 

C411.1.3.4 Shutoff valve. A shutoff valve not less than 
the nominal size of the cormector shall be installed ahead 
of the connector in accordance with Section C409.5. 



C411.1,4 Movable appliances. Where appliances are 
equipped with casters or are otherwise subject to periodic 
movement or relocation for purposes such as routine clean- 
ing and maintenance, such appliances shall be connected to 
the supply system piping by means of an approved flexible 
connector designed and labeled for the application. Such 
flexible connectors shall be installed and protected against 
physical damage in accordance with the manufacturer's 
installation instructions. 



SECTION C41 3 
COMPRESSED NATURAL GAS 
VEHICLE FUEL=DISPENS 



< 



SEFIED PETROLEUM GAS MOTOR 
VEHICLE FUEL-DISPENSING FACILITIES 

C412.1 General. Motor fuel-dispensing facilities for LP-gas 
fuel shall be in accordance with the Fire Code. "^ 



< 



JILITIES 

C413.1 General. Motor fuel-dispensing faciUties for CNG 
fuel shall be in accordance with the Fire Code. 



117.62 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



SECTION C41 4 
SUPPLEMENTAL AND STANDBY GAS SUPPLY 

C414.1 Special supplementary gas. Where air, oxygen or 
other special supplementary gas is. introduced into the gas pip- 
ing system, an approved backflow, preventer shall be installed. 
The backflow preventer shall be on the gas line to the equip- 
ment or appliance supplied by the special gas and located 
between the source of the special gas and the gas meter. Where 
oxygen is used, installation shall be in accordance with NFPA 
51. 

C414.2 Interconnections for standby fuels. Where supple- 
mentary gas for standby use is connected downstream from a 
meter or a service regulator where a meter is not provided, a 
device to prevent backflow shall be installed. A three-way 
valve installed to admit the standby supply and at the same time 
shut off the regular supply shall be permitted to be used for this 
purpose. 



SECTION C41 5 
PIPING SUPPORT INTERVALS 

C415.1 Interval of support. Piping shall be supported at inter- 
vals not exceeding the spacing specified in Table C4 1 5 . 1 . Spac- 
ing of supports for CSST shall be in accordance with the CSST 
manufacturer's instructions. 

TABLE C41 5.1 
SUPPORT OF PIPING 



STEEL PIPE, 

NOMINAL SIZE 

OF PIPE 

(inches) 


SPACING OF 

SUPPORTS 

(feet) 


NOMINAL SIZE 

OF TUBING 

(SMOOTH-WALL) 

(inch O.D.) 


SPACING OF 

SUPPORTS 

(feet) 


'/2 


6 


'I2 


4 


% or 1 


8 


% or 3/4 


6 


1 V4 or larger 
(horizontal) 


10 


%orl 
(Horizontal) 


8 


1 V4 or larger 
(vertical) 


Every floor 
level 


1 or Larger 
(vertical) 


Every floor 
level 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 



SECTION C416 

FUEL-GAS EQUIPMENT AND INSTALLATIONS IN 

MANUFACTURED STRUCTURE (MOBILE HOME OR 

RECREATIONAL VEHICLE) PARKS 

C416.1 Required gas supply. The minimum hourly volume of 
gas required at each manufactured structure (mobile home or 
recreational vehicle) lot outlet or any section of the manufac- 
tured structures park gas-piping system shall be calculated as 
shown in Table C416.1. 

Required gas supply for buildings or other fuel-gas-consum- 
ing appliances connected to the manufactured structure park 
gas-piping system shall be calculated as provided in this 
appendix. 

C416.2 Mechanical protection. Customer-owned gas outlet 
risers, regulators, meters, valves or other exposed equipment 
shall be protected from mechanical damage. Such protection 
may consist of posts, fencing or other permanent barriers. 



Atmospherically controlled regulators shall be installed in 
such a manner that moisture cannot enter the regulator vent and 
accumulate above the diaphragm. When the regulator vent may 
be obstructed by snow or ice, shields, hoods or other suitable 
devices shall be provided to guard against obstruction of the 
vent opening. 

C416.3 Gas meters. Customer-owned meters shall be installed 
in ventilated and accessible locations, not closer than 3 feet 
(914 mm) to sources of ignition. 

When meters are installed, they shall not depend on the gas 
outlet riser for support, but shall be adequately supported by a 
post or bracket placed on a firm footing, or other approved 
means providing equivalent support. 

C416.4 Gas piping size. The size of each section of natural gas 
or LP-gas piping systems shall be determined as specified in 
this appendix. 

TABLE C41 6.1 

MINIMUM DEMAND FACTORS FOR CALCULATING GAS PIPING 

SYSTEMS IN MANUFACTURED STRUCTURE PARKS 



NUMBER OF 
MANUFACTURED 
STRUCTURE LOTS 


DEMAND FACTOR BTU/H 

MANUFACTURED STRUCTURE 

LOT X 0.293 071 FOR W 


1 


250,000 


2 


234,000 


3 


208,000 


4 


198,000 


5 


184,000 


6 


174,000 


7 


166,000 


8 


162,000 


9 


158,000 


10 


154,000 


11-20 


132,000 


21-30 


124,000 


31-40 


118,000 


41-60 


112,000 


Over 60 


102,000 



For SI: 1 Btu/h = 0.2931 W. 

SECTION C41 7 
OVERPRESSURE PROTECTION DEVICES 

C417.1 General. Oyerpressure protection devices shall be pro- 
vided in accordance with this section to prevent the pressure in 
the piping system from exceeding the pressure that would 
cause unsafe operation of any connected and properly adjusted 
appliances. 

C417.2 Protection methods.The requirements of this section 
shall be considered to be met and a piping system deemed to 
have overpressure protection where a service or line pressure 
regulator plus one other device are installed such that the fol- 
lowing occur: 

1. Each device limits the pressure to a value that does not 
■ exceed the maximum working pressure of the down- 
stream system. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.63 



APPENDIX C 



2. The individual failure of either device does not result in 
s^ the overpressurization of the downstream system. 

C4173 Where required. A pressure-relieving or pres- 
sure-limiting device shall not be required where: (1) the gas 
does not contain materials that could seriously interfere with 
the operation of the service or line pressure regulator; (2) the 
operating pressure of the gas source is 60 psi (414 kPa) or less; 
and (3) the service or line pressure regulator has all of the fol- 
lowing design features or characteristics: 

1 . Pipe connections to the service or hne regulator do not 
exceed 2 inches (5 1 mm) nominal diameter. 

2. The regulator is self-contained with no external static or 
control piping. 

3. The regulator has a single port valve with an orifice 
diameter not greater than that recommended by the man- 
ufacturer for the maximum gas pressure at the regulator 
inlet. 

4. The valve seat is made of resilient material designed to 
withstand abrasion of the gas, impurities in the gas and 
cutting by the valve, and to resist permanent deformation 
where it is pressed against the valve port. 

5. The regulator is capable, under normal operating condi- 
tions, of regulating the downstream pressure within the 
necessary limits of accuracy and of limiting the dis- 
charge pressure under no-flow conditions to not more 
than 150 percent of the discharge pressure maintained 
under flow conditions. 

C417.4 DeviceSo Pressure-relieving or pressure-limiting 
devices shall be one of the following: 

1 . Spring-loaded relief device. 

2. Pilot-loaded back pressure regulator used as a relief 
valve and designed so that failure of the pilot system or 
external control piping will cause the regulator relief 
valve to open. 

3. A monitoring regulator installed in series with the ser- 
vice or line pressure regulator. 

4. A series regulator installed upstream from the service or 
line regulator and set to continuously limit the pressure 
on the inlet of the service or line regulator to the maxi- 
mum working pressure of the downstream piping sys- 
tem. 

5. An automatic shutoff device installed in series with the 
service or line pressure regulator and set to shut off when 
the pressure on the downstream piping system reaches 
the maximum working pressure or some other predeter- 
mined pressure less than the maximum working pres- 
sure. This device shall be designed so that it will remain 
closed until manually reset. 

6. A liquid seal relief device that can be set to open accu- 
rately and consistently at the desired pressure. 

The devices shall be installed either as an integral part of the 
service or line pressure regulator or as separate units. Where 
separate pressure-relieving or pressure-limiting devices are 
installed, they shall comply with Sections C417.4.1 through 
C417.4.5. 



C417o4.1 Construction and installation. Pressure rehev- 
ing and pressure-limiting devices shall be constructed of 
materials so that the operation of the devices will not be 
impaired by corrosion of external parts by the atmosphere or 
of internal parts by the gas. Pressure-relieving and pres- 
sure-limiting devices shall be designed and installed so that 
they can be operated to determine whether the valve is free. 
The devices shall also be designed and installed so that they 
can be tested to determine the pressure at which they will 
operate and examined for leakage when in the closed posi- 
tion. 

C417.4.2 External control piping. External control piping 
shall be protected from falling objects, excavations and 
other causes of damage and shall be designed and installed 
so that damage to any control piping will not render both the 
regulator and the overpressure protective device inopera- 
tive. 

C417.4.3 Setting. Each pressure-relieving or pressure-lim- 
iting device shall be set so that the pressure does not exceed 
a safe level beyond the maximum allowable working pres- 
sure for the connected piping and appliances. ^ 

C417.4.4 Vents. The discharge stacks, vents and outlet parts 
of all pressure-relieving and pressure-limiting devices shall 
be located so that gas is safely discharged to the outdoors. 
Discharge stacks and vents shall be designed to prevent the 
entry of water, insects and other foreign material that could 
cause blockage. The discharge stack or vent line shall be at 
least the same size as the outlet of the pressure-relieving 
device. 

C417.4.5 Size of fittings, pipe and openings. The fittings, 
pipe and openings located between the system to be pro- 
tected and the pressure-relieving device shall be sized to 
prevent hammering of the valve and to prevent impairment 
of relief capacity. 



SECTION C501 
GENERAL 

C501.1 Scope. This appendix shall govern the installation, <; 
repair and approval of factory -built chimneys, chimney liners, 
vents and connectors and the utilization of masonry chimneys 
serving gas-fired appliances. The requirements for the installa- 
tion, repair and approval of factory-built chimneys, chimney <^ 
liners, vents and connectors serving appliances burning fuels 
other than fuel gas shall be regulated by this code. The con- 
struction, repair, and approval of masonry chimneys shall be 
regulated by the Building Code. 

C501.2 General. Every apphance shall discharge the products 
of combustion to the outdoors, except for appliances exempted 
by Section C501.8. 

C501.3 Masonry chimneys. Masonry chimneys shall be con- 
structed in accordance with the Building Code. ^ 

C501.4 Minimum size of chimney or vent. Chimneys and 
vents shall be sized in accordance with Section C504. 

C501.5 Abandoned inlet openings. Abandoned inlet open- 
ings in chimneys and vents shall be closed by an approved 
method. 



117.64 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 




II 



C501.6 Positive pressure. Where an appliance equipped with 
a mechanical forced draft system creates a positive pressure in 
the venting system, the venting system shall be designed for 
positive pressure applications. 

C501.7 Connection to fireplace. Connection of appliances to 
chimney flues serving fireplaces shall be in accordance with 
Sections C501.7.1 through C501.7.3. 

C501.7.1 Closure and access. A noncombustible seal shall 
be provided below the point of connection to prevent entry 
of room air into the flue. Means shall be provided for access 
to the flue for inspection and cleaning. 

C501.7.2 Connection to factory-built fireplace flue. An 

appliance shall not be connected to a flue serving a fac- 
tory-built fireplace unless the appliance is specifically listed 
for such installation. The connection shall be made in accor- 
dance with the appliance manufacturer's installation 
instructions. 

C501.7.3 Connection to masonry fireplace flue. A con- 
nector shall extend from the appliance to the flue serving a 
masonry fireplace such that the flue gases are exhausted 
directly into the flue. The connector shall be accessible or 
removable for inspection and cleaning of both the connector 
and the flue. Listed direct connection devices shall be 
installed in accordance with their listing. 

C501.8 Equipment not required to be vented. The following 
appliances shall not be required to be vented. 

1. Ranges. 

2. Built-in domestic cooking units listed and marked for 
optional venting. 

3. Hot plates and laundry stoves. 

4. Type 1 clothes dryers (Type 1 clothes dryers shall be 
exhausted in accordance with the requirements of 
Chapter 5, Section 504.4). 

5. A single booster-type automatic instantaneous water 
heater, where designed and used solely for the sanitiz- 
ing rinse requirements of a dishwashing machine, pro- 
vided that the heater is installed in a commercial 
kitchen having a mechanical exhaust system. Where 
installed in this manner, the draft hood, if required, 
shall be in place and unaltered and the draft hood outlet 
shall be not less than 36 inches (914 mm) vertically and 
6 inches (152 mm) horizontally from any surface other 
than the heater. 

6. Refrigerators. 

7. Counter appliances. 

8. Room heaters listed for unvented use. 

9. Direct-fired make-up air heaters. 

10. Other equipment listed for unvented use and not pro- 
vided with flue collars. 

1 1 . Specialized equipment of limited input such as labora- 
tory burners and gas lights. 

Where the appliances and equipment listed in Items 5 through 
1 1 above are installed so that the aggregate input rating exceeds 
20 British thermal units (Btu) per hour per cubic feet (207 watts 



per m^) of volume of the room or space in which such appliances 
and equipment are installed, one or more shall be provided with 
venting systems or other approved means for conveying the vent 
gases to the outdoor atmosphere so that the aggregate input rat- 
ing of the remaining unvented appliances and equipment does 
not exceed the 20 Btu per hour per cubic foot (207 watts per m^) 
figure. Where the room or space in which the equipment is 
installed is directly connected to another room or space by a 
doorway, archway, or other opening of comparable size that can- 
not be closed, the volume of such adjacent room or space shall be 
permitted to be included in the calculations. 

C501.9 Chimney entrance. Connectors shall connect to a 
masonry chimney flue at a point not less than 12 inches (305 
mm) above the lowest portion of the interior of the chimney flue. 

C501.10 Connections to exhauster. Apphance connections to 
a chimney or vent equipped with a power exhauster shall be 
made on the inlet side of the exhauster. Joints on the positive 
pressure side of the exhauster shall be sealed to prevent 
flue-gas leakage as specified by the manufacturer's installation 
instructions for the exhauster. 

C501.ll Masonry chimneys. Masonry chimneys utilized to 
vent appliances shall be sized as specified in the manufacturer ' s <^ 
installation instructions for the appliances being vented and 
Section C503. 

C501.12 Residential and low-heat appliances flue lining 
systems. Flue lining systems for use with residential-type and 
low-heat appliances shall be limited to the following: 

1. Clay flue lining complying with the requirements of 
ASTM C 315 or equivalent. Clay flue lining shall be 
installed in accordance with the Building Code. 

2. Listed chimney lining systems complying with UL 1777. 

3. Other approved materials that will resist, without crack- 
ing, softening or corrosion, flue gases and condensate at 
temperatures up to 1,800T (982°C). 

C501.13 Category I appliance flue lining systems. Flue lin- 
ing systems for use with Category I appliances shall be limited 
to the following: 

1. Flue lining systems complying with Section C501.12. 

2. Chimney lining systems listed and labeled for use with 
gas appliances with draft hoods and other Category I gas 
appliances listed and labeled for use with Type B vents. 

C501.14 Category 11, III and IV appliance venting systems. 

The design, sizing and installation of vents for Category II, III 
and IV appliances shall be in accordance with the appliance 
manufacturer's installation instructions. 

C501.15 Existing chimneys and vents. Where an appliance is 
permanently disconnected from an existing chimney or vent, or 
where an appliance is connected to an existing chimney or vent 
during the process of a new installation, the chimney or vent 
shall comply with Sections C501.15.1 through C501.15.4. 

C501.15.1 Size. The chimney or vent shall be resized as nec- 
essary to control flue gas condensation in the interior of the 
chimney or vent and to provide the appliance or appUances 
served with the required draft. For Category I appliances, the 
resizing shall be in accordance with Section C502. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.65 



APPENDIX C 



C5®1.15,2 Flue passageways. The flue gas passageway 
shall be free of obstructions and combustible deposits and 
shall be cleaned if previously used for venting a solid or liq- 
uid fuel-burning appliance or fireplace. The flue liner, chim- 
ney inner wall or vent inner wall shall be continuous and 
shall be free of cracks, gaps, perforations or other damage or 
deterioration which would allow the escape of combustion 
products, including gases, moisture and creosote. 

CSOl.15.3 Cleaeout. Masonry chimney flues shall be pro- 
vided with a cleanout opening having a minimum height of 
6 inches (152 mm). The upper edge of the opening shall be 
located not less than 6 inches (152 mm) below the lowest 
chimney inlet opening. The cleanout shall be provided with 
a tight-fitting, noncombustible cover. 

C5©1.15.4 Clearances. Chimneys and vents shall have air- 
space clearance to combustibles in accordance with the Build- 
ing Code and the chimney or vent manufacturer's installation 
instructions. Noncombustible firestopping or fireblocking 
shall be provided in accordance with the Building Code. 

Exception; Masonry chimneys equipped with a chim- 
ney lining system tested and listed for installation in 
chimneys in contact with combustibles in accordance 
with UL 1777, and installed in accordance with the man- 
ufacturer's instructions, shall not be required to have 
clearance between combustible materials and exterior 
surfaces of the masonry chimney. 



SECTION C502 
VENTS 

C502.1 GeeeraL All vents, except as provided in Section 
C503.7, shall be listed and labeled. Type B and BW vents shall 
be tested in accordance with UL 441. Type L vents shall be 
tested in accordance with UL 641. Vents for Category II and III 
appliances shall be tested in accordance with UL 1738. Plastic 
vents for Category IV appliances shall not be required to be 
listed and labeled where such vents are as specified by the 
appliance manufacturer and are installed in accordance with 
the appliance manufacturer's installation instructions. 

C502.2 Connectors required. Connectors shall be used to 
connect appliances to the vertical chimney or vent, except 
where the chimney or vent is attached directly to the appliance. 
Vent connector size, material, construction and installation 
shall be in accordance with Section C503. 

C502.3 Vent application. The application of vents shall be in 
accordance with Table C503.4. 

CS02.4 Insulation shield. Where vents pass through insulated 
assemblies, an insulation shield constructed of not less than 26 
gage sheet (0,016 inch) (0.4 mm) metal shall be installed to pro- 
vide clearance between the vent and the insulation material. The 
clearance shall not be less than the clearance to combustibles 
specified by the vent manufacturer's installation instructions. 
Where vents pass through attic space, the shield shall terminate 
not less than 2 inches (5 1 mm) above the insulation materials and 
shall be secured in place to prevent displacement. Insulation 
shields provided as part of a listed vent system shall be installed 
in accordance with the manufacturer's installation instructions. 



C502.5 Installation. Vent systems shall be sized, installed and 
terminated in accordance with the vent and appliance manufac- 
turer's installation instructions and Section C503. 

C502.6 Support of vents. All portions of vents shall be ade- 
quately supported for the design and weight of the materials 
employed. 

C502.7 Protection against physical damage. In concealed 
locations, where a vent is installed through holes or notches in 
studs, joists, rafters or similar members less than 1.5 inches (38 
mm) from the nearest edge of the member, the vent shall be pro- 
tected by shield plates in accordance with Section 305.5. 



SECTION C503 
VENTING OF APPLIANCES 

C503.1 General. This section recognizes that the choice of 
venting materials and the methods of installation of venting 
systems are dependent on the operating characteristics of the 
appliance being vented. The operating characteristics of vented 
appliances can be categorized with respect to: (1) positive or 
negative pressure within the venting system; and (2) whether or 
not the appliance generates flue or vent gases that might con- 
dense in the venting system. See Section C202 for the defini- 
tions of these vented appliance categories. 

C503.2 Venting systems required. Except as permitted in 
Sections C503.2.1 through C503.2.4 and C501.8, all appli- 
ances shall be connected to venting systems. 

C503.2.1 Ventilating hoods. Ventilating hoods and exhaust 
systems shall be permitted to be used to vent appliances 
installed in commercial applications (see Section C503.3.4) 
and to vent industrial appliances, such as where the process 
itself requires fume disposal. 

C503.2.2 Well-ventilated spaces. Where located in a large 
and well-ventilated space, industrial appliances shall be 
permitted to be operated by discharging the flue gases 
directly into the space. 

C503.2.3 Direct-vent appliances. Listed direct- vent apph- 
ances shall be installed in accordance with the manufac- 
turer's instructions and Section C503.8, Item 3. 

C503.2.4 Appliances with integral vents. Appliances incor- 
porating integral venting means shall be considered properly 
vented where installed in accordance with the manufacturer's 
instructions and Section C503.8, Items 1 and 2. 

C503.3 Design and construction. A venting system shall be 
designed and constructed so as to develop a positive flow 
adequate to convey flue or vent gases to the outdoors. 

C503.3.1 Appliance draft requirements. A venting sys- 
tem shall satisfy the draft requirements of the appliance in 
accordance with the manufacturer's instructions. 

C503,3.2 Design and construction. Appliances required to 
be vented shall be connected to a venting system designed 
and installed in accordance with the provisions of Sections 
C503.4 through C503. 15. 

C503.3.3 Mechanical draft systems. Mechanical draft 
systems shall comply with the following: 



< 



117.66 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



1. Mechanical draft systems shall be hsted and shall be 
installed in accordance with the manufacturer's 
installation instructions for both the appliance and the 
mechanical draft system. 

2. Appliances, except incinerators, requiring venting 
shall be permitted to be vented by means of mechani- 
cal draft systems of either forced or induced draft 
design. 

3. Forced draft systems and all portions of induced draft 
systems under positive pressure during operation 
shall be designed and installed so as to prevent leak- 
age of flue or vent gases into a building. 

4. Vent connectors serving appUances vented by natural 
draft shall not be connected into any portion of mechani- 
cal draft systems operating tinder positive pressure. 

5. Where a mechanical draft system is employed, provi- 
sions shall be made to prevent the flow of gas to the 
main burners when the draft system is not performing 
so as to satisfy the operating requirements of the 
appliance for safe performance. 



6. The exit terminals of mechanical draft systems shall 
be not less than 7 feet (2134 mm) above grade where 
located adjacent to public walkways and shall be 
located as specified in Section C503.8, Items 1 and 2. 

C503.3.4 Ventilating hoods and exhaust systems. Ventilat- 
ing hoods and exhaust systems shall be permitted to be used 
tO;, vent appliances installed in commercial applications. 
Where automatically operated appliances are vented through 
a ventilating hood or exhaust system equipped with a damper 
or with a power means of exhaust, provisions shall be made to 
allow the flow of gas to the main burners only when the 
damper is open to a position to properly vent the appliance 
and when the power means of exhaust is in operation. 

Exception: The interlock between a commercial cooking 
apphance and its exhaust hood system shall not be required 
for manually operated appliances that are factory equipped 
with a standing pilot burner ignition system. Type I and 
Type II commercial cooking exhaust hoods shall be 
designed and installed in accordance with Section 507. 

C503.3.5 Circulating air ducts and furnace plenums. No 

portion of a venting system shall extend into or pass through 
any circulating air duct or furnace plenum. 



TABLE C503.4 
TYPE OF VENTING SYSTEM TO BE USED 




APPLIANCES 


TYPE OF VENTING SYSTEM 


Listed Category I appliances 

Listed appliances equipped with draft hood 

Appliances listed for use with Type B gas vent 


Type B gas vent (Section C503.6) 

Chimney (Section C503.5) 

Single-wall metal pipe (Section C503.7) 

Listed chimney lining system for gas venting (Section C503.5.3) 

Special gas vent listed for these appliances (Section C503.4.2) 


Listed vented wall furnaces 


Type B-W gas vent (Sections C503.6, C608) 


Category II appliances 


As specified or fumishedby manufacturers of listed appliances (Sections 
C503.4.1,C503.4.2) 


Category III appliances 


As specified or furnished by manufacturers of listed appliances (Sections 
C503.4.1,C503.4.2) 


Category IV appliances 


As specified or furnished by manufacturers of listed appliances (Sections 
C503.4.1,C503.4.2) 


Incinerators, indoors 


Chimney (Section C503.5) 


Incinerators, outdoors 


Single-wall metal pipe (Sections C503.7, C503.7.6) 


Appliances that can be converted for use with solid fuel 


Chimney (Section C503.5) 


Unlisted combination gas and oil-burning appliances 


Chimney (Section C503.5) 


Listed combination gas and oil-burning appliances 


Type L vent (Section C503.6) or chimney (Section C503.5) 


Combination gas and solid fuel-burning appliances 


Chimney (Section C503.5) 


Appliances listed for use with chimneys only 


Chimney (Section C503.5) 


Unlisted appliances 


Chimney (Section C503.5) 


Decorative appliances in vented fireplaces 


Chimney 


Gas-fired toilets 


Single-wall metal pipe (Section C626) 


Direct-vent appliances 


See Section C503.2.3 


Appliances with integral vent 


See Section C503.2.4 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.67 



APPENDIX C 



C5033.6 Above-ceilmg air-handfling spaces. Where a 
venting system passes through an above-ceiling air-han- 
dling space or other nonducted portion of an air-handling 
system, the venting system shall conform to one of the fol- 
lowing requirements: 

1 . The venting system shall be a listed special gas vent; 
other venting system serving a Category III or Cate- 
gory IV appliance; or other positive pressure vent, 
with joints sealed in accordance with the appliance or 
vent manufacturer's instructions. 

2. The venting system shall be installed such that fittings 
and joints between sections are not installed in the 
above-ceiling space. 

3. The venting system shall be installed in a conduit or 
enclosure with sealed joints separating the interior of 
the conduit or enclosure from the ceiling space. 

C5©3.4 Type of veeting system to be used. The type of vent- 
ing system to be used shall be in accordance with Table C503.4. 

C5®3.4.1 Plastic piping. Plastic piping used for venting 
appliances listed for use with such venting materials shall be 
approved. 

C503.4.2 Special gas vent. Special gas vent shall be listed 
and installed in accordance with the special gas vent 
manufacturer's installation instructions. 

C503.5 Masonry, metal, and factory-built chimneys. 
Masonry, metal and factory-built chimneys shall comply with 
Sections C503.5.1 through C503.5.10. 

C503.5.1 Factory-built chimneys. Factory-built chimneys 
shall be installed in accordance with the manufacturer's 
installation instructions. Factory-built chimneys used to 
vent appliances that operate at a positive vent pressure shall 
be listed for such application. 

C503.5.2 Metal chimneys. Metal chimneys shall be built 
and installed in accordance with NFPA 211. 

C503.5.3 Masonry chimneys. Masonry chimneys shall be 
built and installed in accordance with the Building Code 
and shall be lined with approved clay flue lining, a listed 
chimney lining system or other approved material that will 
resist corrosion, erosion, softening or cracking from vent 
gases at temperatures up to 1,800°F (982°C). 

Exception: Masonry chimney flues serving listed gas 
appliances with draft hoods. Category I appliances and 
other gas appliances listed for use with Type B vents shall 
be permitted to be lined with a chimney lining system 
specifically listed for use only with such appliances. The 
liner shall be installed in accordance with the hner manu- 
facturer's installation instructions. A permanent identi- 
fying label shall be attached at the point where the 
connection is to be made to the liner. The label shall read: 
"This chimney liner is for appliances that bum gas only. 
Do not connect to solid or liquid fuel-burning appliances 
or incinerators." 

For installation of gas vents in existing masonry chim- 
neys, see Section C503.6.3. 



C503.5.4 Chimney termination. Chimneys for residen- 
tial-type or low-heat appliances shall extend at least 3 feet 
(914 mm) above the highest point where they pass through a 
roof of a building and at least 2 feet (610 mm) higher than 
any portion of a building within a horizontal distance of 10 
feet (3048 mm) (see Figure C503.5.4). Chimneys for 
medium-heat appliances shall extend at least 10 feet (3048 
mm) higher than any portion of any building within 25 feet 
(7620 mm). Chimneys shall extend at least 5 feet (1524 mm) 
above the highest connected appliance draft hood outlet or 
flue collar. Decorative shrouds shall not be installed at the 
termination of factory-built chimneys except where such 
shrouds are listed and labeled for use with the specific fac- 
tory-built chimney system and are installed in accordance 
with the manufacturer's installation instructions. 

C503.5.5 Size of chimneys. The effective area of a chimney 
venting system serving listed appliances with draft hoods. 
Category I appliances, and other appliances listed for use 
with Type B vents shall be determined in accordance with 
one of the following methods: 

1. The provisions of Section C504. 

2. For sizing an individual chimney venting system for a 
single appliance with a draft hood, the effective areas 
of the vent connector and chimney flue shall be not 
less than the area of the appliance flue collar or draft 
hood outlet, nor greater than seven times the draft 
hood outlet area. 

3. For sizing a chimney venting system connected to 
two appliances with draft hoods, the effective area of 
the chimney flue shall be not less than the area of the 
larger draft hood outlet plus 50 peicent of the area of 
the smaller draft hood outlet, nor greater than seven 
times the smallest draft hood outlet area. 

4. Chimney venting systems using mechanical draft 
shall be sized in accordance with approved engineer- 
ing methods. 

5. Other approved engineering methods. 

C503.S.5.1 Incinerator venting. Where an incinerator 
is vented by a chimney serving other appliances, the gas 
input to the incinerator shall not be included in calculat- 
ing chimney size, provided that the chimney flue diame- 
ter is not less than 1 inch (25 nmii) larger in equivalent 
diameter than the diameter of the incinerator flue outlet. 

C503.5.6 Inspection of chimneys. Before replacing an 
existing appliance or connecting a vent connector to a chim- 
ney, the chimney passageway shall be examined to ascertain 
that it is clear and free of obstructions and it shall be cleaned 
if previously used for venting solid or liquid fuel-burning 
appliances or fireplaces. 

C503.5.6.1 Chimney lining. Chimneys shall be lined in 
accordance with NFPA 211. 

Exception: Existing chimneys shall be permitted to 
have their use continued when an appliance is 
replaced by an appliance of similar type, input rating, 
and efficiency. '^ 



117.68 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



10 FT 
OR LESS 



CHIMNEY 



WALL OR 
PARAPET 



3 FT 
MIN 



CHIMNEY 




1^ 

CHIMNEY 



A. TERMINATION 10 FT OR LESS FROM RIDGE, WALL, OR PARAPET 




NOTE: NO HEIGHT 

ABOVE PARAPET 

REQUIRED WHEN 

DISTANCE FROM WALLS 

OR PARAPET IS MORE CHIMNEY 

THAN 10 FT 



HEIGHT ABOVE 
ANY ROOF 
SURFACE WITHIN 
10 FT HORIZONTALLY 




CHIMNEY 



B. TERMINATION MORE THAN 10 FT FROM RIDGE, WALL, OR PARAPET 

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 

FIGURE C503.5.4 

TYPICAL TERMINATION LOCATIONS FOR 

CHIMNEYS AND SINGLE-WALL METAL PIPES SERVING 

RESIDENTIAL-TYPE AND LOW-HEAT EQUIPMENT 



C503.5.6.2 Unsafe chimneys. Where inspection reveals 
that an existing chimney is not safe for the intended 
application, it shall be repaired, rebuilt, lined, relined or 
replaced with a vent or chimney to conform to the build- 
ing code or this code and it shall be suitable for the appli- 
ances to be vented. 

C503.5.7 Chimneys serving equipment burning other 
fuels. Chimneys serving equipment burning other fuels 
shall comply with Sections C503.5.7.1 through C503.5.7.4. 

C503.5.7.1 Solid fuel-burning appliances. An 

appliance shall not be connected to a chimney flue serv- 
ing a separate appliance designed to bum sohd fuel. 

C503.5.7.2 Liquid fuel-burning appliances. Where 
one chimney flue serves gas appliances and liquid 
fuel-burning appliances, the appliances shall be con- 
nected through separate openings or shall be connected 
through a single opening where joined by a suitable fit- 
ting located as close as practical to the chimney. Where 
two or more openings are provided into one chimney 
flue, they shall be at different levels. Where the appli- 
ances are automatically controlled, they shall be 
equipped with safety shutoff devices. 

C503.5.7.3 Combination gas and solid fuel-burning 
appliances. A combination gas- and solid fuel-burning 
appliance shall be permitted to be connected to a single 
chimney flue where equipped with a manual reset device 
to shut off gas to the main burner in the event of sustained 
backdraft or flue gas spillage. The chimney flue shall be 
sized to properly vent the appliance. 

C503.5.7.4 Combination gas- and oil fuel-burning 
appliances. A listed combination gas- and oil fuel-burn- 
ing appliance shall be permitted to be connected to a sin- 
gle chimney flue. The chimney flue shall be sized to 
properly vent the appliance. 

C503.5.8 Support of chimneys. All portions of chimneys 
shall be supported for the design and weight of the materials 
employed. Factory-built chimneys shall be supported and 
spaced in accordance with the manufacturer's installation 
instructions. 

C503.5.9 Cleanouts. Where a chimney that formerly car- 
ried flue products from liquid or solid fuel-burning appli- 
ances is used with an appliance using fuel gas, an accessible 
cleanout shall be provided. The cleanout shall have a 
tight-fitting cover and shall be installed so its upper edge is 
at least 6 inches (152 mm) below the lower edge of the low- 
est chimney inlet opening. 

C503.5.10 Space surrounding lining or vent. The remain- 
ing space surrounding a chimney liner, gas vent, special gas 
vent or plastic piping installed within a masonry chimney 
flue shall not be used to vent another appliance. The inser- 
tion of another liner or vent within the chimney as provided 
in this code and the liner or vent manufacturer's instructions 
shall not be prohibited. 

The remaining space surrounding a chimney Uner, gas vent, 
special gas vent or plastic piping installed within a masonry, 
metal or factory-built chimney shall not be used to supply com- 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.69 



APPENDIX C 



bustion air. Such space shall not be prohibited from supplying 
combustion air to direct- vent appliances designed for installa- 
tion in a solid fuel-burning fireplace and installed in accor- 
dance with the manufacturer's installation instructions. 

C503o6 Gas vents. Gas vents shall comply with Sections 
C503.6.1 through C503.6.12 (see Section C202, Definitions). 

C503.6.1 Installation, general. Gas vents shall be installed 
in accordance with the manufacturer's installation instruc- 
tions. 

C503.6.2 Type B-W vent capacity. A Type B-W gas vent 
shall have a listed capacity not less than that of the listed 
vented wall furnace to which it is connected. 

C503.6.3 Gas vents installed within masonry chimneys. 
Gas vents installed within masonry chimneys shall be 
installed in accordance with the manufacturer's installation 
instructions. Gas vents installed within masonry chimneys 
shall be identified with a permanent label installed at the 
point where the vent enters the chimney. The label shall con- 
tain the following language: "This gas vent is for appliances 
that bum gas. Do not connect to solid or liquid fuel-burning 
appliances or incinerators." 

C503.6.4 Gas vent terminations. A gas vent shall termi- 
nate in accordance with one of the following: 

1. Gas vents that are 12 inches (305 mm) or less in size 
and located not less than 8 feet (2438 mm) from a ver- 
tical wall or similar obstruction shall terminate above 
the roof in accordance with Figure C503.6.4. 

2. Gas vents that are over 12 inches (305 mm) in size or 
are located less than 8 feet (2438 mm) from a vertical 
wall or similar obstruction shall terminate not less 
than 2 feet (610 mm) above the highest point where 
they pass through the roof and not less than 2 feet (610 
mm) above any portion of a building within 10 feet 
(3048 mm) horizontally. 

3. As provided for industrial appliances in Section 
C503.2.2. 

4. As provided for direct-vent systems in Section 
C503.2.3. 

5. As provided for appliances with integral vents in Sec- 
tion C503.2.4. 

6. As provided for mechanical draft systems in Section 
C503.3.3. 

7. As provided for ventilating hoods and exhaust sys- 
tems in Section C503.3.4. 

C503.6.4.1 Decorative shrouds. Decorative shrouds 
shall not be installed at the termination of gas vents 
except where such shrouds are listed for use with the spe- 
cific gas venting system and are installed in accordance 
with manufacturer's installation instructions. 

C503.6.5 Minimum height. A Type B or L gas vent shall 
terminate at least 5 feet (1524 mm) in vertical height above 
the highest connected appliance draft hood or flue collar. A 
Type B-W gas vent shall terminate at least 12 feet (3658 
mm) in vertical height above the bottom of the wall furnace. 




H(MIN.)- 

MINIMUM HEIGHT FROM ROOF 

TO LOWEST DISCHAflGE OPENING 



ROOF SLOPE 


H (min) ft 


Flat to 6/12 


1.0 


Over 6/12 to 7/12 


1.25 


Over 7/12 to 8/12 


1.5 


Over 8/12 to 9/12 


2.0 


Over 9/12 to 10/12 


2.5 


Over 10/12 to 11/12 


3.25 


Over 11/12 to 12/12 


4.0 


Over 12/12 to 14/12 


5.0 


Over 14/12 to 16/12 


6.0 


Over 16/12 to 18/12 


7.0 


Over 18/12 to 20/12 


7.5 


Over 20/12 to 21/12 


8.0 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 

FIGURE C503.6.4 

TERMINATION LOCATIONS FOR GAS VENTS WITH 

LISTED CAPS 12 INCHES OR LESS IN SIZE AT LEAST 8 FEET 



C503.6.6 Roof terminations. Gas vents shall extend 
through the roof flashing, roof jack or roof thimble and ter- 
minate with a listed cap or listed roof assembly. 

C503.6.7 Forced air inlets. Gas vents shall terminate not 
less than 3 feet (914 mm) above any forced air inlet located 
within 10 feet (3048 mm). 

C503.6.8 Exterior wall penetrations. A gas vent extend- 
ing through an exterior wall shall not terminate adjacent to 
the wall or below eaves or parapets, except as provided in 
Sections C503.2.3 and C503.3.3. 

C503.6.9 Size of gas vents. Venting systems shall be sized 
and constructed in accordance with Section C504 or other 
approved engineering methods and the gas vent and appli- 
ance manufacturer's installation instructions. 

C503.6.9.1 Category I appliances. The sizing of natu- 
ral draft venting systems serving one or more listed 
appliances equipped with a draft hood or appliances 
listed for use with Type B gas vent, installed in a single 



117.70 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



Story of a building, shall be in accordance with one of the 
following methods: 

1. The provisions of Section C504. 

2. For sizing an individual gas vent for a single, 
draft-hood-equipped appUance, the effective area of 
the vent connector and the gas vent shall be not less 
than the area of the appUance draft hood outlet, nor 
greater than seven times the draft hood outlet area. 

3. For sizing a gas vent Connected to two appliances 
with draft hoods, the effective area of the vent shall 
be not less than the area of the larger draft hood 
outlet plus 50 percent of the area of the smaller 
draft hood outlet, nor greater than seven times the 
smaller draft hood outlet area. 

4. Approved engineering practices. 

C503.6.9.2 Vent offsets. Type B and L vents sized in 
accordance with Item 2 or 3 of Section C503.6.9.1 shall 
extend in a generally vertical direction with offsets not 
exceeding 45 degrees (0.79 rad), except that a vent system 
having not more than one 60-degree ( 1 .04 rad) offset shall 
be permitted. Any angle greater than 45 degrees (0.79 rad) 
from the vertical is considered horizontal. The total hori- 
zontal distance of a vent plus the horizontal vent connector 
serving draft hood-equipped appliances shall be not 
greater than 75 percent of the vertical height of the vent. 

C503.6.9.3 Category II, III and IV appliances. The 

sizing of gas vents for Category II, III and IV appliances 
shall be in accordance with the appliance manufacturer's 
instructions. 

C503.6,9.4 Mechanical draft. Chimney venting sys-. 
tems using mechanical draft shall be sized in accordance 
with approved engineering methods. 

C503.6.10 Gas vents serving appliances on more than one 
floor. A common gas vent shall be permitted in multistory 
installations to vent Category I appliances located on more 
than one floor level, provided that the venting system is 
designed and installed in accordance with approved engineer- 
ing methods. For the purpose of this section, crawl spaces, 
basements and attics shall be considered as floor levels. 

C503.6.10.1 Appliance separation. All appliances con- 
nected to the common vent shall be located in rooms sep- 
arated from occupiable space. Each of these rooms shall 
have provisions for an adequate supply of combustion, 
ventilation and dilution air that is not supplied from an 
occupiable space (see Figure C503.6.10.1). 

C503.6.10.2 Sizing. The size of the connectors and com- 
mon segments of multistory venting systems for 
appliances listed for use with Type B double-wall gas 
vents shall be in accordance with Table C504.3(l)and 
Figures C-B- 13 and C-B-14 in Appendix C-B, provided: 

1 . The available total height {H) for each segment of a 
multistory venting system is the vertical distance 
between the level of the highest draft hood outlet or 
flue collar on that floor and the centerline of the next 
highest interconnection tee (see Figure C-B- 13). 



GAS FURNACE 




TYPE B GAS VENTS 



AIR GRILLS IN 
OUTSIDE WALL 



LOUVERED DOOR PERMITTED 
TO BE USED IN LIEU OF 
OUTSIDE WALL GRILLS 



FIGURE C503.6.1 0.1 

PLAN VIEW OF PRACTICAL SEPARATION METHOD 

FOR MULTISTORY GAS VENTING 



2. The size of the connector for a segment is 
determined from the appliance input rating and 
available connector rise, and shall not be smaller 
than the draft hood outlet or flue collar size. 

3. The size of the common vertical segment, and of 
the interconnection tee at the base of that segment, 
shall be based on the total appliance input rating 
entering that segment and its available total height. 

C503.6.11 Support of gas vents. Gas vents shall be 
supported and spaced in accordance with the manufac- 
turer's installation instructions. 

C503.6.12 Marking. In those localities where solid and liq- 
uid fuels are used extensively, gas vents shall be perma- 
nently identified by a label attached to the wall or ceiling at a 
point where the vent connector enters the gas vent. The 
determination of where such localities exist shall be made 
by the code official. The label shall read: 

"This gas vent is for appliances that burn gas. 

Do not connect to solid or liquid fuel-burning 

apphances or incinerators." 

C503.7 Single-wall metal pipe. Single-wall metal pipe vents 
shall comply with Sections C503.7.1 through C503.7.12. 

C503.7.1 Construction. Single-wall metal pipe shall be 
constructed of galvanized sheet steel not less than 0.0304 
inch (0.7 mm) thick, or other approved, noncombustible, 
corrosion-resistant material. 

C503.7.2 Cold climate. Uninsulated single-wall metal pipe 
shall not be used outdoors for venting appliances in regions 
where the 99-percent winter design temperature is below 
32T (0°C). 

C503.7.3 Termination. Single-wall metal pipe shall termi- 
nate at least 5 feet (1524 mm) in vertical height above the 
highest connected appliance draft hood outlet or flue collar. 
Single- wall metal pipe shall extend at least 2 feet (610 mm) 
above the highest point where it passes through a roof of a 
building and at least 2 feet (610 mm) higher than any portion 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.71 



APPENDIX C 



of a building within a horizontal distance of 10 feet (3048 
mm) (see Figure C503.5.4). An approved cap or roof assem- 
bly shall be attached to the terminus of a single-wall metal 
pipe (see also Section C503.7.8, Item 3). 

CS(0)3,7.4 Limitations of esco Single-wall metal pipe shall 
be used only for runs directly from the space in which the 
appliance is located through the roof or exterior wall to the 
outdoor atmosphere. 

CSiDi3.7J Moof pemetrations. A pipe passing through a roof 
shall extend without interruption through the roof flashing, 
roof jack, or roof thimble. Where a single-wall metal pipe 
passes through a roof constructed of combustible material, a 
noncombustible, nonventilating thimble shall be used at the 
point of passage. The thimble shall extend at least 18 inches 
(457 mm) above and 6 inches (152 mm) below the roof with 
the annular space open at the bottom and closed only at the 
top. The thimble shall be sized in accordance with Section 
C503.10.15. 

CS(Q>3.7o6 lestallation. Single- wall metal pipe shall not origi- 
nate in any unoccupied attic or concealed space and shall not 
pass through any attic, inside wall, concealed space, or floor. 
The installation of a single- wall metal pipe through an exte- 
rior combustible wall shall comply with Section C503. 10. 15. 
Single-wall metal pipe used for venting an incinerator shall 
be exposed and readily examinable for its full length and shall 
have suitable clearances maintained. 

C5(0i3.7o7 Clearances. Minimum clearances from sin- 
gle-wall metal pipe to combustible material shall be in 
accordance with Table C503.7.7. The clearance from sin- 
gle-wall metal pipe to combustible material shall be permit- 
ted to be reduced where the combustible material is 
protected as specified for vent connectors in Table C308.2. 

C5(D>3o7.8 Size of single- wall metal pipe. A venting system 
constructed of single-wall metal pipe shall be sized in accor- 
dance with one of the following methods and the appliance 
manufacturer's instructions: 



1 . For a draft-hood-equipped appliance, in accordance 
with Section C504. 

2. For a venting system for a single appliance with a 
draft hood, the areas of the connector and the pipe 
each shall be not less than the area of the appliance 
flue collar or draft hood outlet, whichever is smaller. 
The vent area shall not be greater than seven times the 
draft hood outlet area. 

3. Other approved engineering methods. 

C503.7.9 Pipe geometry. Any shaped single-wall metal 
pipe shall be permitted to be used, provided that its equiva- 
lent effective area is equal to the effective area of the round 
pipe for which it is substituted, and provided that the mini- 
mum internal dimension of the pipe is not less than 2 inches 
(51 mm). 

C503.7.10 Termination capacity. The vent cap or a roof 
assembly shall have a venting capacity not less than that of 
the pipe to which it is attached. 

C503.7.11 Support of single- wall metal pipe. All portions 
of single- wall metal pipe shall be supported for the design 
and weight of the material employed. 

C503.7.12 Marking. Single- wall metal pipe shall comply 
with the marking provisions of Section C503.6.12. 

C503.8 Venting system termination location. The location of 
venting system terminations shall comply with the following 
(see Appendix C-C): 

1. A mechanical draft venting system shall terminate at 
least 3 feet (914 mm) above any forced- air inlet located 
within 10 feet (3048 mm). 

Exceptions: 

1 . This provision shall not apply to the combus- 
tion air intake of a direct- vent appliance. 

2. This provision shall not apply to the separation 
of the integral outdoor air inlet and flue gas dis- 
charge of listed outdoor appliances. 



TABLE C503.7.7^ 
CLEARANCES FOR CONNECTORS 



APPLIANCE 


MINIMUM DISTANCE FROM COMBUSTIBLE MATERIAL 


Listed Type B gas 
vent material 


Listed Type L 
vent material 


Single-wall 
metal pipe 


Factory-built 
chimney sections 


Listed appliances with draft hoods and appliances listed for 
use with Type B gas vents 


As listed 


As Usted 


6 inches 


As listed 


Residential boilers and furnaces with listed gas conversion 
burner and with draft hood 


6 inches 


6 inches 


9 inches 


As listed 


Residential appliances listed for use with Type L vents 


Not permitted 


As listed 


9 inches 


As listed 


Listed gas-fired toilets 


Not permitted 


As listed 


As listed 


As listed 


Unlisted residential appliances with draft hood 


Not permitted 


6 inches 


9 inches 


As listed 


Residential and low-heat appliances other than above 


Not permitted 


9 inches 


18 inches 


As listed 


Medium-heat appliances 


Not permitted 


Not permitted 


36 inches 


As listed 



For SI: 1 inch = 25.4 mm. 

a. These clearances shall apply unless the manufacturer's installation instructions for a listed appliance or connector specify different clearances, in which case the 
listed clearances shall apply. 



117.72 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 




2. A mechanical draft venting system, excluding 
direct- vent appliances, shall terminate at least 4 feet 
(1219 mm) below, 4 feet (1219 mm) horizontally from, 
or 1 foot (305 mm) above any door, operable window, or 
gravity air inlet into any building. The bottom of the vent 
terminal shall be located at least 12 inches (305 mm) 
above grade. 

3. The vent terminal of a direct- vent appliance with an 
input of 10,000 Btu per hour (3 kW) or less shall be 
located at least 6 inches (152 mm) from any air opening 
into a building, and such an appliance with an input over 
10,000 Btu per hour (3 kW) but not over 50,000 Btu per 
hour (14.7 kW) shall be installed with a 9-inch (230 mm) 
vent termination clearance, and an appliance with an 
input over 50,000 Btu/h (14.7 kw) shall have at least a 
12-inch (305 mm) vent termination clearance. The bot- 
tom of the vent terminal and the air intake shall be 
located at least 12 inches (305 mm) above grade. 

4. Through-the-wall vents for Category II and IV appli- 
ances and noncategorized condensing appliances shall 
not terminate over public walkways or over an area 
where condensate or vapor could create a nuisance or 
hazard or could be detrimental to the operation of regula- 
tors, rehef valves, or other equipment. Where local expe- 
rience indicates that condensate is a problem with 
Category I and III appliances, this provision shall also 
apply. 

C503.9 Condensation drainage. Provisions shall be made to 
collect and dispose of condensate from venting systems serv- 
ing Category II and IV appliances and noncategorized con- 
densing appliances in accordance with Section C503.8, Item 4. 
Where local experience indicates that condensation is a prob- 
lem, provision shall be made to drain off and dispose of con- 
densate from venting systems serving Category I and III 
appliances in accordance with Section C503.8, Item 4. 

€503.10 Vent connectors for Category I equipment. Vent 
connectors for Category I equipment shall comply with Sec- 
tions C503.10.1 through C503.10.16. 

C503.10.1 Where required. A vent connector shall be used 
to connect an appliance to a gas vent, chimney or single- wall 
metal pipe, except where the gas vent, chimney or sin- 
gle-wall metal pipe is directly connected to the appliance. 

€503. 10.2 Materials. Vent connectors shall be constructed 
in accordance with Sections C503. 10.2.1 through 
C503.10.2.5. 

C503.10.2.1 General. A vent connector shall be made of 
noncombustible corrosion-resistant material capable of 
withstanding the vent gas temperature produced by the 
appliance and of sufficient thickness to withstand 
physical damage. 

€503.10.2.2 Vent connectors located in uncondi- 
tioned areas. Where the vent connector used for an 
appliance having a draft hood or a Category I appliance is 
located in or passes through attics, crawl spaces or other 
unconditioned spaces, that portion of the vent connector 
shall be listed Type B, Type L or listed vent material hav- 
ing equivalent insulation properties. 



Exception: Single- wall metal pipe located within the 
exterior walls of the building in areas having a local 
99-percent winter design temperature of 5°F (-15°C) 
or higher shall be permitted to be used in uncondi- 
tioned spaces other than attics, garages and crawl 
spaces. 

C503.10.2.3 Residential-type appliance connectors. 

Where vent connectors for residential-type appliances 
are not installed in attics or other unconditioned spaces, 
connectors for listed appliances having draft hoods, 
appliances having draft hoods and equipped with listed 
conversion burners and Category I appliances shall be 
one of the following: 

1. Type B or L vent material; 

2. Galvanized sheet steel not less than 0.018 inch 
(0.46 mm) thick; 

3. Aluminum (1100 or 3003 alloy or equivalent) 
sheet not less than 0.027 inch (0.69 mm) thick; 

4. Stainless steel sheet not less than 0.012 inch (0.31 
mm) thick; 

5. Smooth interior wall metal pipe having resistance 
to heat and corrosion equal to or greater than that 
of Item 2, 3 or 4 above; or 

6. A hsted vent connector. 

Vent connectors shall not be covered with insulation. 

Exception: Listed insulated vent connectors shall be 
installed according to the terms of their listing. 

C503. 10.2.4 Low-heat equipment. A vent connector 
for a nonresidential, low-heat appliance shall be a fac- 
tory-built chimney section or steel pipe having resistance 
to heat and corrosion equivalent to that for the appropri- 
ate galvanized pipe as specified in Table C503. 10.2.4. 
Factory-built chimney sections shall be joined together 
in accordance with the chimney manufacturer's instruc- 
tions. 

TABLE C503.1 0.2.4 

MINIMUM THICKNESS FOR GALVANIZED STEEL VENT 

CONNECTORS FOR LOW-HEAT APPLIANCES 



DIAMETER OF CONNECTOR 
(inches) 


MINIMUM THICKNESS 
(inch) 


Less than 6 


0.019 


6 to less than 10 


0.023 


10 to 12 inclusive 


0.029 


14 to 16 inclusive 


0.034 


Over 16 


0.056 



For SI: 1 inch = 25.4 mm. 

C503.10.2.5 Medium-heat appliances. Vent connec- 
tors for medium-heat appliances and commercial and 
industrial incinerators shall be constructed of fac- 
tory-built medium-heat chimney sections or steel of a 
thickness not less than that specified in Table 
C503. 10.2.5 and shall comply with the following: 

1 . A steel vent connector for an appliance with a vent 
gas temperature in excess of 1,000°F (538°C) 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.73 



APPENDIX C 



measured at the entrance to the connector shall be 
lined with medium-duty fire brick (ASTM C 64, 
Type F), or the equivalent. 

2. The lining shall be at least 272 inches (64 mm) 
thick for a vent connector having a diameter or 
greatest cross-sectional dimension of 18 inches 
(457 mm) or less. 

3. The lining shall be at least 4V2 inches (114 mm) 
thick laid on the 4 Vj-inch (114 mm) bed for a vent 
connector having a diameter or greatest 
cross-sectional dimension greater than 18 inches 
(457 mm). 

4. Factory-built chimney sections, if employed, 
shall be joined together in accordance with the 
chimney manufacturer's instructions. 

TABLE C503.1 0.2.5 

llNIWiUiVi THICKNESS FOR STEEL VENT CONNECTORS FOR 
EVIEDIUiVl-HEAT APPLIANCES AND COMMERCIAL AND 

INDUSTRIAL INCINERATORS VENT CONNECTOR SIZE 



DIAMETER 
(inches) 


AREA 
(square inches) 


iVilNIIVIUiU) THICKNESS 
(inch) 


Up to 14 


Up to 154 


0.053 


Over 14 to 16 


154 to 201 


0.067 


Over 16 tol8 


201 to 254 


0.093 


Over 18 


Larger than 254 


0.123 



For SI: 1 inch = 25.4 mm, 1 square inch - 645.16 mm^. 

C5O3.10.3 Size of vent comeector. Vent connectors shall 
be sized in accordance with Sections C503. 10.3.1 through 
C503. 10.3.5. 

C5<0)3,1®.3.1 Single draft hood and fan-assisted. A 
vent connector for an appliance with a single draft hood 
or for a Category I fan-assisted combustion system 
appliance shall be sized and installed in accordance 
with Section C504 or other approved engineering meth- 
ods. 



C503,103.2 Meltiple draft hood. For a single appli- 
ance having more than one draft hood outlet or flue col- 
lar, the manifold shall be constructed according to the 
instructions of the appliance manufacturer. Where there 
are no instructions, the manifold shall be designed and 
constructed in accordance with approved engineering 
practices. As an alternate method, the effective area of 
the manifold shall equal the combined area of the flue 
collars or draft hood outlets and the vent connectors 
shall have a minimum 1-foot (305 mm) rise. 



CS§3. 10.33 Multiple appliances. Where two or more 
appliances are connected to a common vent or chimney, 
each vent connector shall be sized in accordance with 
Section C504 or other approved engineering methods. 

As an alternative method applicable only when all of 
the appliances are draft hood equipped, each vent con- 
nector shall have an effective area not less than the area 
of the draft hood outlet of the appliance to which it is 
connected. 



CS©3.10,3.4 Common connector/manifold. Where 
two or more appliances are vented through a common 
vent connector or vent manifold, the common vent con- 
nector or vent manifold shall be located at the highest 
level consistent with available headroom and the 
required clearance to combustible materials and shall 
be sized in accordance with Section C504 or other 
approved engineering methods. 

As an alternate method applicable only where there 
are two draft hood-equipped appliances, the effective 
area of the common vent connector or vent manifold 
and all junction fittings shall be not less than the area of 
the larger vent connector plus 50 percent of the area of 
the smaller flue collar outlet. 

€503.10.3,5 Size increase. Where the size of a vent 
connector is increased to overcome installation limita- 
tions and obtain connector capacity equal to the appli- 
ance input, the size increase shall be made at the 
appliance draft hood outlet. 

C503.10.4 Two or more appliances connected to a sin- 
gle vent. Where two or more vent connectors enter a com- 
mon gas vent, chimney flue, or single-wall metal pipe, the 
smaller connector shall enter at the highest level consistent 
with the available headroom or clearance to combustible 
material. Vent connectors serving Category I appliances 
shall not be connected to any portion of a mechanical draft 
system operating under positive static pressure, such as 
those serving Category III or IV appliances. 



C503.10.5 Clearance. Minimum clearances from vent 
connectors to combustible material shall be in accordance 
with Table C503.7.7. 

Exception: The clearance between a vent connector 
and combustible material shall be permitted to be 
reduced where the combustible material is protected as 
specified for vent connectors in Table C308.2. 

C503.10.6 Flow resistance. A vent connector shall be 
installed so as to avoid turns or other construction features 
that create excessive resistance to flow of vent gases. 

C503.10.7 Joints. Joints between sections of connector 
piping and connections to flue collars and draft hood out- 
lets shall be fastened by one of the following methods: 

1. Sheet metal screws. 

2. Vent connectors of listed vent material assembled 
and connected to flue collars or draft hood outlets in 
accordance with the manufacturers' instructions. 

3. Other approved means. 

C503.10.8 Slope. A vent connector shall be installed with- 
out dips or sags and shall slope upward toward the vent or 
chimney at least V4 inch per foot (21 mm/m). 

Exception; Vent connectors attached to a mechanical 
draft system installed in accordance with the manufac- 
turers' instructions. 

C503.10.9 Length of vent connector. A vent connector 
shall be as short as practical and the appliance located as 
close as practical to the chimney or vent. The maximum 



117.74 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



horizontal length of a single-wall connector shall be 75 
percent of the height of the chimney or vent except for 
engineered systems. The maximum horizontal length of a 
Type B double- wall connector shall be 100 percent of the 
height of the chimney or vent except for engineered sys- 
tems. For a chimney or vent system serving multiple appli- 
ances, the maximum length of an individual connector, 
from the appliance outlet to the junction with the common 
vent or another connector, shall be 100 percent of the 
height of the chimney or vent. 




0.10 Support. A vent connector shall be supported 
for the design and weight of the material employed to 
maintain clearances and prevent physical damage and sep- 
aration of joints. 

CS03.10.11 Chimney connection. Where entering a flue 
in a masonry or metal chimney, the vent connector shall be 
installed above the extreme bottom to avoid stoppage. 
Where a thimble or slip joint is used to facilitate removal of 
the connector, the connector shall be firmly attached to or 
inserted into the thimble or slip joint to prevent the connec- 
tor from falling out. Means shall be employed to prevent 
the connector from entering so far as to restrict the space 
between its end and the opposite wall of the chimney flue 
(see Section C501. 9). 

C503.10.12 Inspection. The entire length of a vent con- 
nector shall be provided with ready access for inspection, 
cleaning, and replacement. 

C503.10,13 Fireplaces. A vent connector shall not be con- 
nected to a chimney flue serving a fireplace unless the fire- 
place flue opening is permanently sealed. 

C503.10.14 Passage through ceilings, floors or walls. 

Single- wall metal pipe connectors shall not pass through 
any wall, floor or ceiling except as permitted by Sections 
C503.7.4 and C503. 10.15. 

C503.10.15 Single- wall connector penetrations of com- 
bustible walls. A vent connector made of a single-wall 
metal pipe shall not pass through a combustible exterior 
wall unless guarded at the point of passage by a ventilated 
metal thimble not smaller than the following: 

1 . For listed appliances equipped with draft hoods and 
appliances listed for use with Type B gas vents, the 
thimble shall be not less than 4 inches (102 mm) 
larger in diameter than the vent connector. Where 
there is a run of not less than 6 feet ( 1 829 mm) of vent 
connector in the open between the draft hood outlet 
and the thimble, the thimble shall be permitted to be 
not less than 2 inches (51 mm) larger in diameter 
than the vent connector. 

2. For unlisted appliances having draft hoods, the thim- 
ble shall be not less than 6 inches (152 mm) larger in 
diameter than the vent connector. 

3. For residential and low-heat appliances, the thimble 
shall be not less than 12 inches (305 mm) larger in 
diameter than the vent connector. 

Exception: In lieu of thimble protection, all combusti- 
ble material in the wall shall be removed from the vent 



connector a sufficient distance to provide the specified 
clearance from such vent connector to combustible 
material. Any material used to close up such opening 
shall be noncombustible. 

C503.10.16 Medium-heat connectors. Vent connectors 
for medium-heat appliances shall not pass through walls or 
partitions constructed of combustible material. 

C503.ll Vent connectors for Category II, III and IV appli- 
ances. Vent connectors for Category II, III and IV appliances 
shall be as specified for the venting systems in accordance 
with Section C503.4. 

C503.12 Draft hoods and draft controls. The installation of 
draft hoods and draft controls shall comply with Sections 
C503. 12.1 through C503. 12.7. 

C503.12.1 Appliances requiring draft hoods. Vented 
appliances shall be installed with draft hoods. 

Exception: Dual oven-type combination ranges; 
incinerators; direct- vent appliances; fan-assisted com- 
bustion system appliances; appliances requiring chim- 
ney draft for operation; single firebox boilers equipped 
with conversion burners with inputs greater than 
400,000 Btu per hour (117 kw); appliances equipped 
with blast, power or pressure burners that are not listed 
for use with draft hoods; and appliances designed for 
forced venting. 

C503.12.2 Installation. A draft hood supplied with or 
forming a part of a listed vented appliance shall be 
installed without alteration, exactly as furnished and speci- 
fied by the appliance manufacturer. 

C503.12.2.1 Draft hood required. If a draft hood is not 
supplied by the appliance manufacturer where one is 
required, a draft hood shall be installed, shall be of a 
listed or approved type and, in the absence of other 
instructions, shall be of the same size as the appliance 
flue collar. Where a draft hood is required with a con- 
version burner, it shall be of a listed or approved type. 

C503.12.2.2 Special design draft hood. Where it is 
determined that a draft hood of special design is needed 
or preferable for a particular installation, the installa- 
tion shall be in accordance with the recommendations 
of the appliance manufacturer and shall be approved. 

C503.12.3 Draft control devices. Where a draft control 
device is part of the appliance or is supplied by the appli- 
ance manufacturer, it shall be installed in accordance with 
the manufacturer's instructions. In the absence of manu- 
facturer's instructions, the device shall be attached to the 
flue collar of the appliance or as near to the appliance as 
practical. 

C503.12.4 Additional devices. Appliances (except incin- 
erators) requiring a controlled chimney draft shall be per- 
mitted to be equipped with a listed double-acting 
barometric -draft regulator installed and adjusted in accor- 
dance with the manufacturer's instructions. 

C503.12.5 Location. Draft hoods and barometric draft 
regulators shall be installed in the same room or enclosure 
as the appliance in such a manner as to prevent any differ- 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.75 



APPENDIX C 



ence in pressure between the hood or regulator and the 
combustion air supply. 



CS03.12.6 PositioHing. Draft hoods and draft regulators 
shall be installed in the position for which they were 
designed with reference to the horizontal and vertical 
planes and shall be located so that the relief opening is not 
obstructed by any part of the appliance or adjacent con- 
struction. The appliance and its draft hood shall be located 
so that the relief opening is accessible for checking vent 
operation. 

C503.12.7 Clearance. A draft hood shall be located so its 
relief opening is not less than 6 inches (152 mm) from any 
surface except that of the appliance it serves and the vent- 
ing system to which the draft hood is connected. Where a 
greater or lesser clearance is indicated on the appliance 
label, the clearance shall be not less than that specified on 
the label. Such clearances shall not be reduced. 

C503.13 Maemally operated dampers. A manually oper- 
ated damper shall not be placed in the vent connector for any 
appliance. Fixed baffles shall not be classified as manually 
operated dampers. 

C5(D3.14 Aetomatically operated vent dampers. An auto- 
matically operated vent damper shall be of a listed type. 

C5(Q>3.15 Otostrectioms. Devices that retard the flow of vent 
gases shall not be installed in a vent connector, chimney or 
vent. The following shall not be considered as obstructions: 

1 . Draft regulators and safety controls specifically listed 
for installation in venting systems and installed in 
accordance with the manufacturer's installation 
instructions. 

2. Approved draft regulators and safety controls that are 
designed and installed in accordance with approved 
engineering methods. 

3. Listed heat reclaimers and automatically operated vent 
dampers installed in accordance with the 
manufacturer's installation instructions. 

4. Approved economizers, heat reclaimers and recupera- 
tors installed in venting systems of appliances not 
required to be equipped with draft hoods, provided that 
the appliance manufacturer's instructions cover the 
installation of such a device in the venting system and 
performance in accordance with Sections C503.3 and 
C503.3.1 is obtained. 

5. Vent dampers serving listed appliances installed in 
accordance with Sections C504.2.1 and C504.3.1 or 
other approved engineering methods. 



SECTBOI 

SIZING OF CATEGORY 1 APPLIANCE 
VENTING SYSTEMS 

C5®4.1 DelGmitioinis. The following definitions apply to the 
tables in this section. 

APPLIANCE CATEGORIZED VENT BIAME- 
TEM/AREA. The minimum vent area/diameter permissible 
for Category I appliances to maintain a nonpositive vent static 



pressure when tested in accordance with nationally recog- 
nized standards. 

FAN-ASSISTED COMBUSTION SYSTEM. An appliance 
equipped with an integral mechanical means to either draw or 
force products of combustion through the combustion cham- 
ber or heat exchanger. 

FAN Min. The minimum input rating of a Category I 
fan-assisted appliance attached to a vent or connector. 

FAN Max. The maximum input rating of a Category I 
fan-assisted appliance attached to a vent or connector. 



Max. The maximum input rating of a Category I 
draft-hood-equipped appliance attached to a vent or connec- 
tor. 

FAN + FAN. The maximum combined appliance input rating 
of two or more Category I fan-assisted appliances attached to 
the common vent. 

FAN + NAT. The maximum combined appliance input rating 
of one or more Category I fan-assisted appliances and one or 
more Category I draft-hood-equipped appliances attached to 
the common vent. 

NA. Vent configuration is not allowed due to potential for 
condensate formation or pressurization of the venting system, 
or not applicable due to physical or geometric restraints. 

NAT + NAT, The maximum combined appliance input rating 
of two or more Category I draft-hood-equipped appliances 
attached to the common vent. 

C504.2 Application of single-appliance vent Tables 
C504.2(l) through C504.2(6). The application of Tables 
C504.2(l) through C504.2(6) shall be subject to the require- 
ments of Sections C504.2.1 through C504.2.16. 

CS04.2.1 Vent obstrnctions. These venting tables shall 
not be used where obstructions, as described in Section 
C503.15, are installed in the venting system. The installa- 
tion of vents serving listed appliances with vent dampers 
shall be in accordance with the appliance manufacturer's 
instructions or in accordance with the following: 

1. The maximum capacity of the vent system shall be 
determined using the "NAT Max" column. 

2. The minimum capacity shall be determined as if the 
appliance were a fan-assisted appliance, using the 
"FAN Min" column to determine the minimum 
capacity of the vent system. Where the correspond- 
ing "FAN Min" is "NA," the vent configuration shall 
not be permitted and an alternative venting configu- 
ration shall be utilized. 

C504.2.2 Minimum size. Where the vent size determined 
from the tables is smaller than the appliance draft hood 
outlet or flue collar, the smaller size shall be permitted to 
be used provided that all of the following requirements are 
met: 

1. The total vent height {H) is at least 10 feet (3048 
mm). 



117.76 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



2. Vents for appliance draft hood outlets or flue collars 
12 inches (305 mm) in diameter or smaller are not 
reduced more than one tablesize. 

3. Vents for appliance draft hood outlets or flue collars 
larger than 12 inches (305 mm) in diameter are not 
reduced more than two table sizes. 

4. The maximum capacity listed in the tables for a 
fan-assisted appliance is reduced by 10 percent (0.90 
X maximum table capacity). 

5. The draft hood outlet is greater than 4 inches (102 
mm) in diameter. Do not connect a 3-inch-diameter 
(76 mm) vent to a 4-inch-diameter (102 mm) draft 
hood outlet. This provision shall not apply to 
fan-assisted appliances. 

C504.2.3 Vent offsets. Single-appliance venting configu- 
rations with zero (0) lateral lengths in Tables C504.2(l), 
C504.2(2) and C504.2(5) shall not have elbows in the vent- 
ing system. Single-appliance venting configurations with 
lateral lengths include two 90-degree (1.57 rad) elbows. 
For each additional elbow up to and including 45 degrees 
(0.79 rad), the maximum capacity listed in the venting 
tables shall be reduced by 5 percent. For each additional 
elbow greater than 45 degrees (0.79 rad) up to and includ- 
ing 90 degrees (1.57 rad), the maximum capacity listed in 
the venting tables shall be reduced by 10 percent. 

C504.2.4 Zero lateral. Zero (0) lateral (L) shall apply only 
to a straight vertical vent attached to a top outlet draft hood 
or flue collar. 

C504.2.5 High-altitude installations. Sea-level input rat- 
ings shall be used when determining maximum capacity 
for high altitude installation. Actual input (derated for alti- 
tude) shall be used for determining minimum capacity for 
high altitude installation. 

C504.2.6 Multiple input rate appliances. For appliances 
with more than one input rate, the minimum vent capacity 
(FAN Min) determined from the tables shall be less than 
the lowest appliance input rating, and the maximum vent 
capacity (FAN Max/NAT Max) determined from the tables 
shall be greater than the highest appliance rating input. 

C504.2.7 Liner system sizing and connections. Listed 
corrugated metallic chimney liner systems in masonry 
chimneys shall be sized by using Table C504.2(l) or 
C504.2(2) for Type B vents with the maximum capacity 
reduced by 20 percent (0.80 x maximum capacity) and the 
minimum capacity as shown in Table C504.2(l) or 
C504.2(2). Corrugated metallic liner systems installed 
with bends or offsets shall have their maximum capacity 
further reduced in accordance with Section C504.2.3. The 
20-percent reduction for corrugated metallic chimney 
liner systems includes an allowance for one long-radius 
90-degree (1.57 rad) turn at the bottom of the liner. 

Connections between chimney liners and listed dou- 
ble-wall connectors shall be made with listed adapters 
designed for such purpose. 

C504.2.8 Vent area and diameter. Where the vertical vent 
has a larger diameter than the vent connector, the vertical 



vent diameter shall be used to determine the minimum vent 
capacity, and the connector diameter shall be used to deter- 
mine the maximum vent capacity. The flow area of the verti- 
cal vent shall not exceed seven times the flow area of the 
listed appliance categorized vent area, flue collar area, or 
draft hood outlet area unless designed in accordance with 
approved engineering methods. 

C504.2.9 Chimney and vent locations. Tables C504.2(l), 
C504.2(2), C504.2(3), C504.2(4) and C504.2(5) shall only 
be used for chimneys and vents not exposed to the outdoors 
below the roof line. A Type B vent or listed chimney lining 
system passing through an unused masonry chimney flue 
shall not be considered to be exposed to the outdoors. A 
Type B vent shall not be considered to be exposed to the out- 
doors where it passes through an unventilated enclosure or 
chase insulated to a value of not less than R8. 

Table C504.2(3) in combination with Table C504.2(6) 
shall be used for clay-tile-lined exterior masonry chimneys, 
provided that all of the following are met: 

1. Vent connector is a Type B double wall. 

2. Vent connector length is limited to 1 V2 feet for each 
inch (18 mm per mm) of vent connector diameter. 

3. The appliance is draft hood equipped. 

4. The input rating is less than the maximum capacity 
given by Table C504.2(3). 

5. For a water heater, the outdoor design temperature is 
not less than 5°F(-15°C). 

6. For a space-heating appliance, the input rating is 
greater than the minimum capacity given by Table 

C504.2(6). 

Where these conditions cannot be met, an alternative 
venting design shall be used, such as a listed chimney lining 
system. 

Exception: The installation of vents serving listed appli- 
ances shall be permitted to be in accordance with the 
appliance manufacturer's installation instructions. 

C504.2.10 Corrugated vent connector size. Corrugated 
vent connectors shall be not smaller than the listed appli- 
ance categorized vent diameter, flue collar diameter, or draft 
hood outlet diameter. 

C504.2.11 Vent connector size limitation. Vent connec- 
tors shall not be increased in size more than two sizes greater 
than the listed appliance categorized vent diameter, flue col- 
lar diameter, or draft hood outlet diameter. 

C504.2.12 Component commingling. In a single run of 
vent or vent connector, different diameters and types of vent 
and connector components shall be permitted to be used, 
provided that all such sizes and types are permitted by the 
tables. 

C504.2.13 Draft hood conversion accessories. Draft hood 
conversion accessories for use with masonry chimneys 
venting listed Category I fan-assisted appliances shall be 
listed and installed in accordance with the manufacturer's 
installation instructions for such listed accessories. 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.77 



TABLE C504.2(1) 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Connected directly to vent 



HEIGHT 

(H) 

(feet) 


LATERAL 

(L) 

(feet) 


VENT DIAiWETER— (D; inches 


3 


4 


5 


6 


7 


8 


9 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 








78 


46 





152 


86 





251 


141 





375 


205 





524 


285 





698 


370 





897 


470 


2 


13 


51 


36 


18 


97 


67 


27 


157 


105 


32 


232 


157 


44 


321 


217 


53 


425 


285 


63 


543 


370 


4 


21 


49 


34 


30 


94 


64 


39 


153 


103 


50 


227 


153 


66 


316 


211 


79 


419 


279 


93 


536 


362 


6 


25 


46 


32 


36 


91 


61 


47 


149 


100 


59 


223 


149 


78 


310 


205 


93 


413 


273 


110 


530 


354 


8 








84 


50 





165 


94 





276 


155 





415 


235 





583 


320 





780 


415 





1,006 


537 


2 


12 


57 


40 


16 


109 


75 


25 


178 


120 


28 


263 


180 


42 


365 


247 


50 


483 


322 


60 


619 


418 


5 


23 


53 


38 


32 


103 


71 


42 


171 


115 


53 


255 


173 


70 


356 


237 


83 


473 


313 


99 


607 


407 


8 


28 


49 


35 


39 


98 


66 


51 


164 


109 


64 


247 


165 


84 


347 


227 


99 


463 


303 


117 


596 


396 


10 








88 


53 





175 


100 





295 


166 





447 


255 





631 


345 





847 


450 





1,096 


585 


2 


12 


61 


42 


17 


118 


81 


23 


194 


129 


26 


289 


195 


40 


402 


273 


48 


533 


355 


57 


684 


457 


5 


23 


57 


40 


32 


113 


77 


41 


187 


124 


52 


280 


188 


68 


392 


263 


81 


522 


346 


95 


671 


446 


10 


30 


51 


36 


41 


104 


70 


54 


176 


115 


67 


267 


175 


88 


376 


245 


104 


504 


330 


122 


651 


427 


15 








94 


58 





191 


112 





327 


187 





502 


285 





716 


390 





970 


525 





1,263 


682 


2 


11 


69 


48 


15 


136 


93 


20 


226 


150 


22 


339 


225 


38 


475 


316 


45 


633 


414 


53 


815 


544 


5 


22 


65 


45 


30 


130 


87 


39 


219 


142 


49 


330 


217 


64 


463 


300 


76 


620 


403 


90 


800 


529 


10 


29 


59 


41 


40 


121 


82 


51 


206 


135 


64 


315 


208 


84 


445 


288 


99 


600 


386 


116 


777 


507 


15 


35 


53 


37 


48 


112 


76 


61 


195 


128 


76 


301 


198 


98 


429 


275 


115 


580 


373 


134 


755 


491 


20 








97 


61 





202 


119 





349 


202 





540 


307 





776 


430 





1,057 


575 





1,384 


752 


2 


10 


75 


51 


14 


149 


100 


18 


250 


166 


20 


377 


249 


33 


531 


346 


41 


711 


470 


50 


917 


612 


5 


21 


71 


48 


29 


143 


96 


38 


242 


160 


47 


367 


241 


62 


519 


337 


73 


697 


460 


86 


902 


599 


10 


28 


64 


44 


38 


133 


89 


50 


229 


150 


62 


351 


228 


81 


499 


321 


95 


675 


443 


112 


877 


576 


15 


34 


58 


40 


46 


124 


84 


59 


217 


142 


73 


337 


217 


94 


481 


308 


111 


654 


427 


129 


853 


557 


20 


48 


52 


35 


55 


116 


78 


69 


206 


134 


84 


322 


206 


107 


464 


295 


125 


634 


410 


145 


830 


537 



(continued) 



TABLE C504.2(1)— continued 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Connected directly to vent 



HEIGHT 
(feet) 


LATERAL 

(L) 

(feet) 


VENT DIAMETER— (D^ inches 


3 


4 


5 


6 


7 


8 


9 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 








100 


64 





213 


128 





■ 374 


220 





587 


336 





853 


475 





1,173 


650 





1,548 


855 


2 


9 


81 


56 


13 


166 


112 


14 


283 


185 


18 


432 


280 


27 


613 


394 


33 


826 


535 


42 


1,072 


700 


5 


21 


77 


54 


28 


160 


108 


36 


275 


176 


45 


421 


273 


58 


600 


385 


69 


811 


524 


82 


1,055 


688 


10 


27 


70 


50 


37 


150 


102 


48 


262 


171 


59 


405 


261 


77 


580 


371 


91 


788 


507 


107 


1,028 


668 


15 


33 


64 


NA 


44 


141 


96 


57 


249 


163 


70 


389 


249 


90 


560 


357 


105 


765 


490 


124 


1,002 


648 


20 


56 


58 


NA 


53 


132 


90 


66 


237 


154 


80 


374 


237 


102 


542 


343 


119 


743 


473 


139 


977 


628 


30 


NA 


NA 


NA 


73 


113 


NA 


88 


214 


NA 


104 


346 


219 


131 


507 


321 


149 


702 


444 


171 


929 


594 


50 








101 


67 





216 


134 





397 


232 





633 


363 





932 


518 





1,297 


708 





1,730 


952 


2 


8 


86 


61 


11 


183 


122 


14 


320 


206 


15 


497 


314 


22 


715 


445 


26 


975 


615 


33 


1,276 


813 


5 


20 


82 


NA 


27 


177 


119 


35 


312 


200 


43 


487 


308 


55 


702 


438 


65 


960 


605 


77 


1,259 


798 


10 


26 


76 


NA 


35 


168 


114 


45 


299 


190 


56 


471 


298 


73 


681 


426 


86 


935 


589 


101 


1,230 


773 


15 


59 


70 


NA 


42 


158 


■ NA 


54 


287 


180 


66 


455 


288 


85 


662 


413 


100 


911 


572 


117 


1,203 


747 


20 


NA 


NA 


NA 


50 


149 


na' 


63 


275 


169 


76 


440 


278 


97 


642 


401 


113 


888 


556 


131 


1,176 


722 


30 


NA 


NA 


NA 


69 


131 


NA 


84 


250 


NA 


99 


410 


259 


123 


605 


376 


141 


844 


522 


161 


1,125 


670 


100 





NA 


NA 


NA 





218 


NA 





407 


NA 





665 


400 





997 


560 





1,411 


770 





1,908 


1,040 


2 


NA 


NA 


NA 


10 


194 


NA 


12 


354 


NA 


13 


566 


375 


18 


831 


510 


21 


1,155 


700 


25 


1,536 


935 


5 


NA 


NA 


NA 


26 


189 


NA 


33 


347 


NA 


40 


557 


369 


52 


820 


504 


60 


1,141 


692 


71 


1,519 


926 


10 


NA 


. NA 


NA 


33 


182 


NA 


43 


335 


NA 


53 


542 


361 


68 


801 


493 


80 


1,118 


679 


94 


1,492 


910 


15 


NA 


NA 


NA 


40 


174 


NA 


50 


321 


NA 


62 


528 


353 


80 


782 


482 


93 


1,095 


666 


109 


1,465 


895 


20 


NA 


NA 


NA 


47 


166 


NA 


59 


311 


NA 


71 


513 


344 


90 


763 


471 


105 


1,073 


653 


122 


1,438 


880 


30 


NA 


NA 


NA 


NA ■ 


NA 


NA 


78 


290 


NA 


92 


483 


NA 


115 


726 


449 


131 


1,029 


627 


149 


1,387 


849 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


147 


428 


NA 


180 


651 


405 


197 


944 


575 


217 


1,288 


787 



(continued) 



TABLE C504.2(1)— continued 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Connected directly to vent 



HEIGHT 

(H) 
(feet) 


LATERAL 
(feet) 


VENT DIAMETER— (O) inches 


10 


12 


14 


16 


18 


20 


22 


24 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 








1,121 


570 





1,645 


850 





2,267 


1,170 





2,983 


1,530 





3,802 


1,960 





4,721 


2,430 





5,737 


2,950 





6,853 


3,520 


2 


75 


675 


455 


103 


982 


650 


138 


1,346 


890 


178 


1,769 


1,170 


225 


2,250 


1,480 


296 


2,782 


1,850 


360 


3,377 


2,220 


426 


4,030 


2,670 


4 


110 


668 


445 


147 


975 


640 


191 


1,338 


880 


242 


1,761 


1,160 


300 


2,242 


1,475 


390 


2,774 


1,835 


469 


3,370 


2,215 


555 


4,023 


2,660 


6 


128 


661 


435 


171 


967 


630 


219 


1,330 


870 


276 


1,753 


1,150 


341 


2,235 


1,470 


437 


2,767 


1,820 


523 


3,363 


2,210 


618 


4,017 


2,650 


8 








1,261 


660 





1,858 


970 





2,571 


1,320 





3,399 


1,740 





4,333 


2,220 





5,387 


2,750 





6,555 


3,360 





7,838 


4,010 


2 


71 


770 


515 


98 


1,124 


745 


130 


1,543 


1,020 


168 


2,030 


1,340 


212 


2,584 


1,700 


278 


3,196 


2,110 


336 


3,882 


2,560 


401 


4,634 


3,050 


5 


115 


758 


503 


154 


1,110 


733 


199 


1,528 


1,010 


251 


2,013 


1,330 


311 


2,563 


1,685 


398 


3,180 


2,090 


476 


3,863 


2,545 


562 


4,612 


3,040 


8 


137 


746 


490 


180 


1,097 


720 


231 


1,514 


1,000 


289 


2,000 


1,320 


354 


2,552 


1,670 


450 


3,163 


2,070 


537 


3,850 


2,530 


630 


4,602 


3,030 


10 








1,377 


720 





2,036 


1,060 





2,825 


1,450 





3,742 


1,925 





4,782 


2,450 





5,955 


3,050 





7,254 


3,710 





8,682 


4,450 


2 


68 


852 


560 


93 


1,244 


850 


124 


1,713 


1,130 


161 


2,256 


1,480 


202 


2,868 


1,890 


264 


3,556 


2,340 


319 


4,322 


2,840 


378 


5,153 


3,390 


5 


112 


839 


547 


149 


1,229 


829 


192 


1,696 


1,105 


243 


2,238 


1,461 


300 


2,849 


1,871 


382 


3,536 


2,318 


458 


4,301 


2,818 


540 


5,132 


3,371 


10 


142 


817 


525 


187 


1,204 


795 


238 


1,669 


1,080 


298 


2,209 


1,430 


364 


2,818 


1,840 


459 


3,504 


2,280 


546 


4,268 


2,780 


641 


5,099 


3,340 


15 
20 








1,596 


840 





2,380 


1,240 





3,323 


1,720 





4,423 


2,270 





5,678 


2,900 





7,099 


3,620 





8,665 


4,410 





10,393 


5,300 


2 


63 


1,019 


675 


86 


1,495 


985 


114 


2,062 


1,350 


147 


2,719 


1,770 


186 


3,467 


2,260 


239 


4,304 


2,800 


290 


5,232 


3,410 


346 


6,251 


4,080 


5 


105 


1,003 


660 


140 


1,476 


967 


182 


2,041 


1,327 


229 


2,696 


1,748 


283 


3,442 


2,235 


355 


4,278 


2,777 


426 


5,204 


3,385 


501 


6,222 


4,057 


10 


135 


977 


635 


177 


1,446 


936 


227 


2,009 


1,289 


283 


2,659 


1,712 


346 


3,402 


2,193 


432 


4,234 


2,739 


510 


5,159 


3,343 


599 


6,175 


4,019 


15 


155 


953 


610 


202 


1,418 


905 


257 


1,976 


1,250 


318 


2,623 


1,675 


385 


3,363 


2,150 


479 


4,192 


2,700 


564 


5,115 


3,300 


665 


6,129 


3,980 








1,756 


930 





2,637 


1,350 





3,701 


1,900 





4,948 


2,520 





6,376 


3,250 





7,988 


4,060 





9,785 


4,980 





11,753 


6,000 


2 


59 


1,150 


755 


81 


1,694 


1,100 


107 


2,343 


1,520 


139 


3,097 


2,000 


175 


3,955 


2,570 


220 


4,916 


3,200 


269 


5,983 


3,910 


321 


7,154 


4,700 


5 


101 


1,133 


738 


135 


1,674 


1,079 


174 


2,320 


1,498 


219 


3,071 


1,978 


270 


3,926 


2,544 


337 


4,885 


3,174 


403 


5,950 


3,880 


475 


7,119 


4,662 


10 


130 


1,105 


710 


172 


1,641 


1,045 


220 


2,282 


1,460 


273 


3,029 


1,940 


334 


3,880 


2,500 


413 


4,835 


3,130 


489 


5,896 


3,830 


573 


7,063 


4,600 


15 


150 


1,078 


688 


195 


1,609 


1,018 


248 


2,245 


1,425 


306 


2,988 


1,910 


372 


3,835 


2,465 


459 


4,786 


3,090 


541 


5,844 


3,795 


631 


7,007 


4,575 


20 


167 


1,052 


665 


217 


1,578 


990 


273 


2,210 


1,390 


335 


2,948 


1,880 


404 


3,791 


2,430 


495 


4,737 


3,050 


585 


5,792 


3,760 


689 


6,953 


4,550 



(continued) 



TABLE C504.2(1)— continued 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Connected directly to vent 



m 
o 

> 

z 

o 

> 

l- 
(A 
M 

m 
o 



HEIGHT 

(H) 
(feet) 


LATERAL 

m 

(feet) 


VENT DIAMETER— ('?) inches 


10 


12 


14 


16 


18 


20 


22 


24 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 








1,977 


1,060 





3,004 


1,550 





4,252 


2,170 





5,725 


2,920 





7,420 


3,770 





9,341 


4,750 





11,483 


5,850 





13,848 


7,060 


2 


54 


1,351 


865 


74 


2,004 


1,310 


98 


2,786 


1,800 


127 


3,696 


2,380 


159 


4,734 


3,050 


199 


5,900 


3,810 


241 


7,194 


4,650 


285 


8,617 


5,600 


5 


96 


1,332 


851 


127 


1,981 


1,289 


164 


2,759 


1,775 


206 


3,666 


2,350 


252 


4,701 


3,020 


312 


5,863 


3,783 


373 


7,155 


4,622 


439 


8,574 


5,552 


10 


125 


1,301 


829 


164 


1,944 


1,254 


209 


2,716 


1,733 


259 


3,617 


2,300 


316 


4,647 


2,970 


386 


5,803 


3,739 


456 


7,090 


4,574 


535 


8,505 


5,471 


15 


143 


1,272 


807 


187 


1,908 


1,220 


237 


2,674 


1,692 


292 


3,570 


2,250 


354 


4,594 


2,920 


431 


5,744 


3,695 


507 


7,026 


4,527 


590 


8,437 


5,391 


20 


160 


1,243 


784 


207 


1,873 


1,185 


260 


2,633 


1,650 


319 


3,523 


2,200 


384 


4,542 


2,870 


467 


5,686 


3,650 


548 


6,964 


4,480 


639 


8,370 


5,310 


30 


195 


1,189 


745 


246 


1,807 


1,130 


305 


2,555 


1,585 


369 


3,433 


2,130 


440 


4,442 


2,785 


540 


5,574 


3,565 


635 


6,842 


4,375 


739 


8,239 


5,225 


50 








2,231 


1,195 





3,441 


1,825 





4,934 


2,550 





6,711 


3,440 





8,774 


4,460 





11,129 


5,635 





13,767 


6,940 





16,694 


8,430 


2 


41 


1,620 


1,010 


66 


2,431 


1,513 


86 


3,409 


2,125 


113 


4,554 


2,840 


141 


5,864 


3,670 


171 


7,339 


4,630 


209 


8,980 


5,695 


251 


10,788 


6,860 


5 


90 


1,600 


996 


118 


2,406 


1,495 


151 


3,380 


2,102 


191 


4,520 


2,813 


234 


5,826 


3,639 


283 


7,295 


4,597 


336 


8,933 


5,654 


394 


10,737 


6,818 


10 


118 


1,567 


972 


154 


2,366 


1,466 


196 


3,332 


2,064 


243 


4,464 


2,767 


295 


5,763 


3,585 


355 


7,224 


4,542 


419 


8,855 


5,585 


491 


10,652 


6,749 


15 


136 


1,536 


948 


177 


2,327 


1,437 


222 


3,285 


2,026 


274 


4,409 


2,721 


330 


5,701 


3,534 


396 


7,155 


4,511 


465 


8,779 


5,546 


542 


10,570 


6,710 


20 


151 


1,505 


924 


195 


2,288 


1,408 


244 


3,239 


1,987 


300 


4,356 


2,675 


361 


5,641 


3,481 


433 


7,086 


4,479 


506 


8,704 


5,506 


586 


10,488 


6,670 


30 


183 


1,446 


876 


232 


2,214 


1,349 


287 


3,150 


1,910 


347 


4,253 


2,631 


412 


5,523 


3,431 


494 


6,953 


4,421 


577 


8,557 


5,444 


672 


10,328 


6,603 


100 








2,491 


1,310 





3,925 


2,050 





5,729 


2,950 





7,914 


4,050 





10,485 


5,300 





13,454 


6,700 





16,817 


8,600 





20,578 


10,300 


2 


30 


1,975 


1,170 


44 


3,027 


1,820 


72 


4,313 


2,550 


95 


5,834 


3,500 


120 


7,591 


4,600 


138 


9,577 


5,800 


169 


11,803 


7,200 


204 


14,264 


8,800 


5 


82 


1,955 


1,159 


107 


3,002 


1,803 


136 


4,282 


2,531 


172 


5,797 


3,475 


208 


7,548 


4,566 


245 


9,528 


5,769 


293 


11,748 


7,162 


341 


14,204 


8,756 


10 


108 


1,923 


1,142 


142 


2,961 


1,775 


180 


4,231 


2,500 


223 


5,737 


3,434 


268 


7,478 


4,509 


318 


9,447 


5,717 


374- 


11,658 


7,100 


436 


14,105 


8,683 


15 


126 


1,892 


1,124 


163 


2,920 


1,747 


206 


4,182 


2,469 


252 


5,678 


3,392 


304 


7,409 


4,451 


358 


9,367 


5,665 


418 


11,569 


7,037 


487 


14,007 


8,610 


20 


141 


1,861 


1,107 


181 


2,880 


1,719 


226 


4,133 


2,438 


277 


5,619 


3,351 


330 


7,341 


4,394. 


387 


9,289 


5,613 


452 


11,482 


6,975 


523 


13,910 


8,537 


30 


170 


1,802 


1,071 


215 


2,803 


1,663 


265 


4,037 


2,375 


319 


5,505 


3,267 


378 


7,209 


4,279 


446 


9,136 


5,509 


514 


11,310 


6,850 


592 


13,720 


8,391 


50 


241 


1,688 


1,000 


292 


2,657 


1,550 


350 


3,856 


2,250 


415 


5,289 


3,100 


486 


6,956 


4,050 


572 


8,841 


5,300 


659 


10,979 


6,600 


752 


13,354 


8,100 



For ST: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour - 0.2931 W. 



> 
TJ 

T3 

m 

z 
g 

X 

o 



TABLE C504.2(2) 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Single-wall metal connector 



HEIGHT 

(H) 
(feet) 


LATERAL 

{L) 

(feet) 


VENT DIAMETER— {D) inches 


3 4 slelylsls io|i2 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 





38 


77 


45 


59 


151 


85 


85 


249 


140 


126 


373 


204 


165 


522 


284 


211 


695 


369 


267 


894 


469 


371 


1,118 


569 


537 


1,639 


849 


2 


39 


51 


36 


60 


96 


66 


85 


156 


104 


123 


231 


156 


159 


320 


213 


201 


423 


284 


251 


541 


368 


347 


673 


453 


498 


979 


648 


4 


NA 


NA 


33 


74 


92 


63 


102 


152 


102 


146 


225 


152 


187 


313 


208 


237 


416 


277 


295 


533 


360 


409 


664 


443 


584 


971 


638 


6 


NA 


NA 


31 


83 


89 


60 


114 


147 


99 


163 


220 


148 


207 


307 


203 


263 


409 


271 


327 


526 


352 


449 


656 


433 


638 


962 


627 


8 





37 


83 


50 


58 


164 


93 


83 


273 


154 


123 


412 


234 


161 


580 


319 


206 


777 


414 


258 


1,002 


536 


360 


1,257 


658 


521 


1,852 


967 


2 


39 


56 


39 


59 


108 


75 


83 


176 


119 


121 


261 


179 


155 


363 


246 


197 


482 


321 


246 


617 


417 


339 


768 


513 


486 


1,120 


743 


5 


NA 


NA 


37 


77 


102 


69 


107 


168 


114 


151 


252 


171 


193 


352 


235 


245 


470 


311 


305 


604 


404 


418 


754 


500 


598 


1,104 


730 


8 


NA 


NA 


33 


90 


95 


64 


122 


161 


107 


175 


243 


163 


223 


342 


225 


280 


458 


300 


344 


591 


392 


470 


740 


486 


665 


1,089 


715 


10 





37 


87 


53 


57 


174 


99 


82 


293 


165 


120 


444 


254 


158 


628 


344 


202 


844 


449 


253 


1,093 


584 


351 


1,373 


718 


507 


2,031 


1,057 


2 


39 


61 


41 


59 


117 


80 


82 


193 


128 


119 


287 


194 


153 


400 


272 


193 


531 


354 


242 


681 


456 


332 


849 


559 


475 


1,242 


848 


5 


52 


56 


39 


76 


111 


76 


105 


185 


122 


148 


277 


186 


190 


388 


261 


241 


518 


344 


299 


667 


443 


409 


834 


544 


584 


1,224 


825 


10 


NA 


NA 


34 


97 


100 


68 


132 


171 


112 


188 


261 


171 


237 


369 


241 


296 


497 


325 


363 


643 


423 


492 


808 


520 


688 


1,194 


788 


15 





36 


93 


57 


56 


190 


111 


80 


325 


186 


116 


499 


283 


153 


713 


388 


195 


966 


523 


244 


1,259 


681 


336 


1,591 


838 


488 


2,374 


1,237 


2 


38 


69 


47 


57 


136 


93 


80 


225 


149 


115 


337 


224 


148 


473 


314 


187 


631 


413 


232 


812 


543 


319 


1,015 


673 


457 


1,491 


983 


5 


51 


63 


44 


75 


128 


86 


102 


216 


140 


144 


326 


217 


182 


459 


298 


231 


616 


400 


287 


795 


526 


392 


997 


657 


562 


1,469 


963 


10 


NA 


NA 


39 


95 


116 


79 


128 


201 


131 


182 


308 


203 


228 


438 


284 


284 


592 


381 


349 


768 


501 


470 


966 


628 


664 


1,433 


928 


15 


NA 


NA 


NA 


NA 


NA 


72 


158 


186 


124 


220 


290 


192 


272 


418 


269 


334 


568 


367 


404 


742 


484 


540 


937 


601 


750 


1,399 


894 


20 





35 


96 


60 


54 


200 


118 


78 


346 


201 


114 


537 


306 


149 


772 


428 


190 


1,053 


573 


238 


1,379 


750 


326 


1,751 


927 


473 


2,631 


1,346 


2 


37 


74 


50 


56 


148 


99 


78 


248 


165 


113 


375 


248 


144 


528 


344 


182 


708 


468 


227 


914 


611 


309 


1,146 


754 


443 


1,689 


1,098 


5 


50 


68 


47 


73 


140 


94 


100 


239 


158 


141 


363 


239 


178 


514 


334 


224 


692 


457 


279 


896 


596 


381 


1,126 


734 


547 


1,665 


1,074 


10 


NA 


NA 


41 


93 


129 


86 


125 


223 


146 


177 


344 


224 


222 


491 


316 


277 


666 


437 


339 


866 


570 


457 


1,092 


702 


646 


1,626 


1,037 


15 


NA 


NA 


NA 


NA 


NA 


80 


155 


208 


136 


216 


325 


210 


264 


469 


301 


325 


640 


419 


393 


838 


549 


526 


1,060 


677 


730 


1,587 


1,005 


20 


NA 


NA 


NA 


NA 


NA 


NA 


186 


192 


126 


254 


306 


196 


309 


448 


285 


374 


616 


400 


448 


810 


526 


592 


1,028 


651 


808 


1,550 


973 



(continued) 



o 
u 
m 
O 
O 



TABLE C504.2(2)— continued 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Single-wall metal connector 



m 
O 

z 
> 
z 

o 

> 

l- 

(O 
13 

m 
o 

> 



HEIGHT 

(H) 
(feet) 


LATERAL 

{L) 

(feet) 


VENT DIAMETER— (D) inches 


345678910 12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


IVIax 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 





34 


99 


63 


53 


211 


127 


76 


372 


219 


110 


584 


334 


144 


849 


472 


184 


1,168 


647 


229 


1,542 


852 


312 


1,971 


1,056 


454 


2,996 


1,545 


2 


37 


80 


56 


55 


164 


111 


76 


281 


183 


109 


429 


279 


139 


610 


392 


175 


823 


533 


219 


1,069 


698 


296 


1,346 


863 


424 


1,999 


1,308 


5 


49 


74 


52 


72 


157 


106 


98 


271 


173 


136 


417 


271 


171 


595 


382 


215 


806 


521 


269 


1.049 


684 


366 


1,324 


846 


524 


1,971 


1,283 


10 


NA 


NA 


NA 


91 


144 


98 


122 


255 


168 


171 


397 


257 


213 


570 


367 


265 


777 


501 


327 


1,017 


662 


440 


1,287 


821 


620 


1,927 


1,234 


15 


NA 


NA 


NA 


115 


131 


NA 


151 


239 


157 


208 


377 


242 


255 


547 


349 


312 


750 


481 


379 


985 


638 


507 


1,251 


794 


702 


1,884 


1.205 


20 


NA 


NA 


NA 


NA 


NA 


NA 


181 


223 


NA 


246 


357 


228 


298 


524 


333 


360 


723 


461 


433 


955 


615 


570 


1,216 


768 


780 


1,841 


1,166 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


•NA 


NA 


NA 


389 


477 


305 


461 


670 


426 


541 


895 


574 


704 


1,147 


720 


937 


1,759 


1,101 


50 





33 


99 


66 


51 


213 


133 


73 


394 


230 


105 


629 


361 


138 


928 


515 


176 


1,292 


704 


220 


1,724 


948 


295 


2,223 


1,189 


428 


3,432 


1,818 


2 


36 


84 


61 


53 


181 


121 


73 


318 


205 


104 


495 


312 


133 


712 


443 


168 


971 


613 


209 


1,273 


811 


280 


1,615 


1.007 


401 


2,426 


1,509 


5 


48 


80 


NA 


70 


174 


117 


94 


308 


198 


131 


482 


305 


164 


696 


435 


204 


953 


602 


257 


1,252 


795 


347 


1,591 


991 


496 


2,396 


1,490 


10 


NA 


NA 


NA 


89 


160 


NA 


118 


292 


186 


162 


461 


292 


203 


671 


420 


253 


923 


583 


313 


1,217 


765 


418 


1,551 


963 


589 


2,347 


1,455 


15 


NA 


NA 


NA 


112 


148 


NA 


145 


275 


174 


199 


441 


280 


244 


646 


405 


299 


894 


562 


363 


1,183 


736 


481 


1,512 


934 


668 


2,299 


1,421 


20 


NA 


NA 


NA 


NA 


NA 


NA 


176 


257 


NA 


236 


420 


267 


285 


622 


389 


345 


866 


543 


415 


1,150 


708 


544 


1,473 


906 


741 


2,251 


1,387 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


315 


376 


NA 


373 


573 


•NA 


442 


809 


502 


521 


1,086 


649 


674 


1,399 


848 


892 


2,159 


1,318 


100 





'NA 


NA 


NA 


49 


214 


NA 


69 


403 


NA 


100 


659 


395 


131 


991 


555 


166 


1,404 


765 


207 


1,900 


1,033 


273 


2,479 


1,300 


395 


3,912 


2,042 


2 


NA 


NA 


NA 


51 


192 


NA 


70 


351 


NA 


98 


563 


373 


125 


828 


508 


158 


1,152 


698 


196 


1,532 


933 


259 


1,970 


1,168 


371 


3,021 


1,817 


5 


NA 


NA 


NA 


67 


186 


NA 


90 


342 


NA 


125 


551 


366 


156 


813 


501 


194 


1,134 


688 


240 


1,511 


921 


322 


1,945 


1,153 


460 


2,990 


1,796 


10 


NA 


NA 


NA 


85 


175 


NA 


113 


324 


NA 


153 


532 


354 


191 


789 


486 


238 


1,104 


672 


293 


1,477 


902 


389 


1,905 


1,133 


547 


2,938 


1,763 


15 


NA 


NA 


NA 


132 


162 


NA 


138 


310 


NA 


188 


511 


343 


230 


764 


473 


281 


1,075 


656 


342 


1,443 


884 


447 


1,865 


1,110 


618 


2,888 


1,730 


20 


NA 


NA 


NA 


NA 


NA 


NA 


168 


295 


NA 


224 


487 


NA 


270 


739 


458 


325 


1,046 


639 


391 


1,410 


864 


507 


1,825 


1,087 


690 


2,838 


1,696 


30 


NA 


NA 


NA 


NA 


NA 


NA 


231 


264 


NA 


301 


448 


NA 


355 


685 


NA 


418. 


988 


NA 


491 


1,343 


824 


631 


1,747 


1.041 


834 


2,739 


1,627 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


540 


584 


NA 


617 


866 


NA 


711 


1,205 


NA 


895 


1,591 


NA 


1,138 


2,547 


1,489 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.293 1 W. 



TABLE C504.2(3) 
MASONRY CHIMNEY 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double-wall connector 



HEIGHT 

(H) 
(feet) 


LATERAL 
(feet) 


TYPE B DOUBLE-WALL CONNECTOR DIAMETER— (D) inches 
to be used with chimney areas within the size limits at bottom 


3 


4 


5 


6 


7 


8 


9 


10 


12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


2 


NA 


NA 


28 


NA 


NA 


52 


NA 


NA 


86 


NA 


NA 


130 


NA 


NA 


180 


NA 


NA 


247 


NA 


NA 


320 


NA 


NA 


401 


NA 


NA 


581 


5 


NA 


NA 


25 


NA 


NA 


49 


NA 


NA 


82 


NA 


NA 


117 


NA 


NA 


165 


NA 


NA 


231 


NA 


NA 


298 


NA 


NA 


376 


NA 


NA 


561 


8 


2 


NA 


NA 


29 


NA 


NA 


55 


NA 


NA 


93 


NA 


NA 


145 


NA 


NA 


198 


NA 


NA 


266 


84 


590 


350 


100 


728 


446 


139 


1,024 


651 


5 


NA 


NA 


26 


NA 


NA 


52 


NA 


NA 


,88 


NA 


NA 


134 


NA 


NA 


183 


NA 


NA 


247 


NA 


NA 


328 


149 


711 


423 


201 


1,007 


640 


8 


NA 


NA 


24 


NA 


NA 


48 


NA 


NA 


83 


NA 


NA 


127 


NA 


NA 


175 


NA 


NA 


239 


NA 


NA 


318 


173 


695 


410 


231 


990 


623 


10 


2 


NA 


NA 


31 


NA 


NA 


61 


NA 


NA 


103 


NA 


NA 


162 


NA 


NA 


221 


68 


519 


298 


82 


655 


388 


98 


810 


491 


136 


1,144 


724 


5 


NA 


NA 


28 


NA 


NA 


57 


NA 


NA 


96 


NA 


NA 


148 


NA 


NA 


204 


NA 


NA 


277 


124 


638 


365 


146 


791 


466 


196 


1,124 


712 


10 


NA 


NA 


25 


NA 


NA 


50 


NA 


NA 


87 


NA 


NA 


139 


NA 


NA 


191 


NA 


NA 


263 


155 


610 


347 


182 


762 


444 


240 


1,093 


668 


15 


2 


NA 


NA 


35 


NA 


NA 


67 


NA 


NA 


114 


NA 


NA 


179 


53 


475 


250 


64 


613 


336 


77 


779 


441 


92 


968 


562 


127 


1,376 


841 


5 


NA 


NA 


35 


NA 


NA 


62 


NA 


NA 


107 


NA 


NA 


164 


NA 


NA 


231 


99 


594 


313 


118 


759 


416 


139 


946 


533 


186 


1,352 


828 


10 


NA 


NA 


28 


NA 


NA 


55 


NA 


NA 


97 


NA 


NA 


153 


NA 


NA 


216 


126 


565 


296 


148 


727 


394 


173 


912 


567 


229 


1,315 


777 


15 


NA 


NA 


NA 


NA 


NA 


48 


NA 


NA 


89 


NA 


NA 


141 


NA 


NA 


201 


NA 


NA 


281 


17! 


698 


375 


198 


880 


485 


259 


1,280 


742 


20 


2 


NA 


NA 


38 


NA 


NA 


74 


NA 


NA 


124 


NA 


NA 


201 


51 


522 


274 


61 


678 


375 


73 


867 


491 


87 


1,083 


627 


121 


1,548 


953 


5 


NA 


NA 


36 


NA 


NA 


68 


NA 


NA 


116 


NA 


NA 


184 


80 


503 


254 


95 


658 


350 


113 


845 


463 


133 


1,059 


597 


179 


1,523 


933 


10 


NA 


NA 


NA 


NA 


NA 


60 


NA 


NA 


107 


NA 


NA 


172 


NA 


NA 


237 


122 


627 


332 


143 


811 


440 


167 


1,022 


566 


221 


1,482 


879 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


97 


NA 


NA 


159 


NA 


NA 


220 


NA 


NA 


314 


165 


780 


418 


191 


987 


541 


251 


1,443 


840 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


83 


NA 


NA 


148 


NA 


NA 


206 


NA 


NA 


296 


186 


750 


397 


214 


955 


513 


277 


1,406 


807 



(continued) 




TABLE C504.2(3)— continued 
MASONRY CHIMNEY 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double-wall connector 



HEIGHT 

(H) 
(feet) 


LATERAL 

(L) 

(feet) 


TYPE B DOUBLE-WALL CONNECTOR DIAMETER— (D) inches 
to be used with chimney areas within the size limits at bottom 


3 


4 


5 


6 


7 


8 


9 


10 


12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 


2 


NA 


NA 


41 


NA 


NA 


82 


NA 


NA 


137 


NA 


NA 


216 


47 


581 


303 


57 


762 


421 


68 


985 


558 


81 


1,240 


717 


111 


1,793 


1,112 


5 


NA 


NA 


NA 


NA 


NA 


76 


NA 


NA 


128 


NA 


NA 


198 


75 


561 


281 


90 


741 


393 


106 


962 


526 


125 


1,216 


683 


169 


1,766 


1,094 


10 


NA 


NA 


NA 


NA 


NA 


67 


NA 


NA 


115 


NA 


NA 


184 


NA 


NA 


263 


115 


709 


373 


135 


927 


500 


158 


1,176 


648 


210 


1,721 


1,025 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


107 


NA 


NA 


171 


NA 


NA 


243 


NA 


NA 


353 


156 


893 


476 


181 


1,139 


621 


239 


1,679 


981 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


91 


NA 


NA 


159 


NA 


NA 


227 


NA 


NA 


332 


176 


860 


450 


203 


1,103 


592 


264 


1,638 


940 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


188 


NA 


NA 


288 


NA 


NA 


416 


249 


1,035 


555 


318 


1,560 


877 


50 


2 


NA 


NA 


NA 


NA 


NA 


92 


NA 


NA 


161 


NA 


NA 


251 


NA 


NA 


351 


51 


840 


477 


61 


1,106 


633 


72 


1,413 


812 


99 


2,080 


1,243 


5 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


151 


NA 


NA 


230 


NA 


NA 


323 


83 


819 


445 


98 


1,083 


596 


116 


1,387 


774 


155 


2,052 


1,225 


10 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


138 


NA 


NA 


215 


NA 


NA 


304 


NA 


NA 


424 


126 


1,047 


567 


147 


1,347 


733 


195 


2,006 


1,147 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


127 


NA 


NA 


199 


NA 


NA 


282 


NA 


NA 


400 


146 


1,010 


539 


170 


1,307 


702 


222 


1,961 


1,099 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


185 


NA 


NA 


264 


NA 


NA 


376 


165 


977 


511 


190 


1,269 


669 


246 


1,916 


1,050 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


327 


NA 


NA 


468 


233 


1,196 


623 


295 


1,832 


984 


Minimum Internal 

Area of Chimney 

(square inches) 


12 


19 


28 


38 


50 


63 


78 


95 


132 


Maximum Internal 

Area of Chimney 

(square inches) 


49 


88 


137 


198 


.269 


352 


445 


550 


792 



For SI: 1 inch = 25.4 mm, 1 square inch = 645. 16 mm^, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W. 



TABLE C504.2(4) 
MASONRY CHIMNEY 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Single-wall metal connector 



ro 

o 
o 
■>J 

O 
3D 

m 
o 
o 

m 
o 

> 
z 

o 
> 
r" 

(/) 
-0 
m 
o 



HEIGHT 

(H) 
(feet) 


LATERAL 

m 

(feet) 


SINGLE-WALL METAL CONNECTOR DIAMETER— (D) inches 
to be used with chimney areas within the size limits at bottom 


3 


4 


5 


6 


7 


8 


9 


10 


12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


2 


NA 


NA 


28 


NA 


NA 


52 


NA 


NA 


86 


NA 


NA 


130 


NA 


NA 


180 


NA 


NA 


247 


NA 


NA 


319 


NA 


NA 


400 


NA 


NA 


580 


5 


NA 


NA 


25 


NA 


NA 


48 


NA 


NA 


81 


NA 


NA 


116 


NA 


NA 


164 


NA 


NA 


230 


NA 


NA 


297 


NA 


NA 


375 


NA 


NA 


560 


8 


2 


NA 


NA 


29 


NA 


NA 


55 


NA 


NA 


93 


NA 


NA 


145 


NA 


NA 


197 


NA 


NA 


265 


NA 


NA 


349 


382 


725 


445 


549 


1,021 


650 


5 


NA 


NA 


26 


NA 


NA 


51 


NA 


NA 


87 


NA 


NA 


133 


NA 


NA 


182 


NA 


NA 


246 


NA 


NA 


327 


NA 


NA 


422 


673 


1,003 


638 


8 


NA 


NA 


23 


NA 


NA 


47 


NA 


NA 


82 


NA 


NA 


126 


NA 


NA 


174 


NA 


NA 


237 


NA 


NA 


317 


NA 


NA 


408 


747 


985 


621 


10 


2 


NA 


NA 


31 


NA 


NA 


61 


NA 


NA 


102 


NA 


NA 


161 


NA 


NA 


220 


216 


518 


297 


271 


654 


387 


373 


808 


490 


536 


1,142 


722 


5 


NA 


NA 


28 


NA 


NA 


56 


NA 


NA 


95 


NA 


NA 


147 


NA 


NA 


203 


NA 


NA 


276 


334 


635 


364 


459 


789 


465 


657 


1,121 


710 


10 


NA 


NA 


24 


NA 


NA 


49 


NA 


NA 


86 


NA 


NA 


137 


NA 


NA 


189 


NA 


NA 


261 


NA 


NA 


345 


547 


758 


441 


771 


1,088 


665 


15 


2 


NA 


NA 


35 


NA 


NA 


67 


NA 


NA 


113 


NA 


NA 


178 


166 


473 


249 


211 


611 


335 


264 


776 


440 


362 


965 


560 


520 


1,373 


840 


5 


NA 


NA 


32 


NA 


NA 


61 


NA 


NA 


106 


NA 


NA 


163 


NA 


NA 


230 


261 


591 


312 


325 


775 


414 


444 


942 


531 


637 


1,348 


825 


10 


NA 


NA 


27 


NA 


NA 


54 


NA 


NA 


96 


NA 


NA 


151 


NA 


NA 


214 


NA 


NA 


294 


392 


722 


392 


531 


907 


504 


749 


1,309 


774 


15 


NA 


NA 


NA 


NA 


NA 


46 


NA 


NA 


87 


NA 


NA 


138 


NA 


NA 


198 


NA 


NA 


278 


452 


692 


372 


606 


873 


481 


841 


1,272 


738 


20 


2 


NA 


NA 


38 


NA 


NA 


73 


NA 


NA 


123 


NA 


NA 


200 


163 


520 


273 


206 


675 


374 


258 


864 


490 


252 


1,079 


625 


508 


1,544 


950 


5 


NA 


NA 


35 


NA 


NA 


67 


NA 


NA 


115 


NA 


NA 


183 


80 


NA 


252 


255 


655 


348 


317 


842 


461 


433 


1,055 


594 


623 


1,518 


930 


10 


NA 


NA 


NA 


NA 


NA 


59 


NA 


NA 


105 


NA 


NA 


170 


NA 


NA 


235 


312 


622 


330 


382 


806 


437 


517 


1,016 


562 


733 


1,475 


875 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


95 


NA 


NA 


156 


NA 


NA 


217 


NA 


NA 


311 


442 


773 


414 


591 


979 


539 


823 


1,434 


835 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


80 


NA 


NA 


144 


NA 


NA 


202 


NA 


NA 


292 


NA 


NA 


392 


663 


944 


510 


911 


1,394 


800 



(continued) 



to 

o 
o 

O 
J3 

m 
o 
o 



TABLE C504.2(4)— continued 
MASONRY CHIMNEY 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Single-wall metal connector 



HEIGHT 

(H) 
(feet) 


LATERAL 
(feet) 


SINGLE-WALL METAL CONNECTOR DIAMETER— (D) inches 
to be used with chimney areas within the size limits at bottom 


3 


4 


5 


6 


7 


8 


9 


10 


12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 


2 


NA 


NA 


41 


NA 


NA 


81 


NA 


NA 


136 


NA 


NA 


215 


158 


578.. 


302 


200 


759 


420 


249 


982 


556 


340 


1,237 


715 


489 


1,789 


1,110 


5 


NA 


NA 


NA 


NA 


NA 


75 


NA 


NA 


127 


NA 


NA. 


196 


NA 


NA 


279 


245 


737 


391 


306 


958 


524 


417 


1,210 


680 


600 


1,760 


1,090 


10 


NA 


NA 


NA 


NA 


NA 


66 


NA 


NA 


113 


NA 


NA 


182 


NA 


NA 


260 


300 


703 


370 


370 


920 


496 


500 


1,168 


644 


708 


1,713 


1,020 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


105 


NA 


NA 


168 


NA 


NA 


240 


NA 


NA 


349 


428 


884 


471 


572 


1,128 


615 


798 


1,668 


975 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


88 


NA 


NA 


155 


NA 


NA 


223 


NA 


NA 


327 


NA 


NA 


445 


643 


1,089 


585 


883 


1,624 


932 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


182 


NA 


NA 


281 


NA 


NA 


408 


NA 


NA 


544 


1,055 


1,539 


865 


50 


2 


NA 


NA 


NA 


NA 


NA 


91 


NA 


NA 


160 


NA 


NA 


250 


NA 


NA 


350 


191 


837 


475 


238 


1,103 


631 


323 


1,408 


810 


463 


2,076 


1,240 


5 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


149 


NA 


NA 


228 


NA 


NA 


321 


NA 


NA 


442 


293 


1,078 


593 


398 


1,381 


770 


571 


2,044 


1,220 


10 


LNA_ 


NA 


NA 


NA 


NA 


NA' 


NA 


NA 


136 


NA 


NA 


212 


NA 


NA 


301 


NA 


NA 


420 


355 


1,038 


562 


447 


1,337 


728 


674 


1,994 


1,140 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


124 


NA 


NA 


195 


NA. 


NA 


278 


NA 


NA 


395 


NA 


NA 


533 


546 


1,294 


695 


761 


1,945 


1,090 


20 


NA 


NA 


NA 


NA 


NA 


NA 


.NA 


NA 


NA 


NA 


NA 


180 


NA 


NA 


258 


NA 


NA 


370 


NA 


NA 


504 


616 


1,251 


660 


844 


1,898 


1,040 


30 


NA 


NA 


NA 


NA 


NA 


48 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


318 


NA 


NA 


458 


NA 


NA 


610 


1,009 


1,805 


970 


Minimum 
Internal Area of 

Chimney 
(square inches) 


12 


19 


28 


38 


50 


63 


78 


95 


132 


Maximum 
Internal Area of 

Chimney 
(square inches) 


49 


88 


137 


198 


269 


352 


445 


550 


792 



For SI: 1 inch = 25.4 mm, 1 square inch - 645.16 mm^, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W. 



APPENDIX C 



TABLE C504.2(5) 

SINGLE-WALL METAL PIPE OR TYPE B 

ASBESTOS CEMENT VENT 



Number of Appliances 


Single 


Appliance Type 


Draft hood equipped 


Appliance Vent Connection 


Connected directly to pipe or vent 



HEIGHT 

(H) 
(feet) 


LATERAL 

{L) 

(feet) 


VENT DIAMETER— (D) inches 


3 


4 


5 I 


6 


7 


8 


10 


12 




MAXIIVIUM APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 




6 





39 


70 


116 


170 


232 


312 


500 


750 


2 


31 


55 


94 


141 


194 


260 


415 


620 


5 


28 


51 


88 


128 


177 


242 


390 


600 


8 





42 


76 


126 


185 


252 


340 


542 


815 


2 


32 


61 


102 


154 


210" 


284 


451 


680 


5 


29 


56 


95 


141 


194 


264 


430 


648 


10 


24 


49 


86 


131 


180 


250 


406 


625 


10 





45 


84 


138 


202 


279 


372 


606 


912 


2 


35 


67 


111 


168 


233 


311 


505 


760 


5 


32 


61 


104 


153 


215 


289 


480 


724 


10 


27 


54 


94 


143 


200 


274 


455 


700 


15 


NA 


46 


84 


130 


186 


258 


432 


666 


15 





49 


91 


151 


223 


312 


420 


684 


1,040 


2 


39 


72 


122 


186 


260 


350 


570 


865 


5 


35 


67 


110 


170 


240 


325 


540 


825 


10 


30 


58 


103 


158 


223 • 


308 


514 


795 


15 


NA 


50 


93 


144 


207 


291 


488 


760 


20 


NA 


NA 


82 


132 


195 


273 


466 


726 


20 





53 


101 


163 


252 


342 


470 


770 


1,190 


2 


42 


80 


136 


210 


286 


392 


641 


990 


5 


38 


74 


123 


192 


264 


364 


610 


945 


10 


32 


65 


115 


178 


246 


345 


571 


910 


15 


NA 


55 


104 


163 


228 


326 


550 


870 


20 


NA 


NA 


91 


149 


214 


306 


525 


832 


30 





56 


108 


183 


276 


384 


529 


878 


1,370 


2 


44 


84 


148 


230 


320 


441 


730 


1,140 


5 


NA 


78 


137 


210 


296 


410 


694 


1,080 


10 


NA 


68 


125 


196 


274 


388 


656 


1,050 


15 


NA 


NA 


113 


177 


258 


366 


625 


1,000 


20 


NA 


NA 


99 


163 


240 


344 


596 


960 


30 


NA 


NA 


NA 


NA 


192 


295 


540 


890 


50 





NA 


120 


210 


310 


443 


590 


980 


1,550 


2 


NA 


95 


171 


260 


370 


492 


820 


1,290 


5 


NA 


NA 


159 


234 


342 


474 


780 


1,230 


10 


NA 


NA 


146 


221 


318 


456 


730 


1,190 


15 


NA 


NA 


NA 


200 


292 


407 


705 


1,130 


20 


NA 


NA 


NA 


185 


276 


384 


670 


1,080 


30 


NA 


NA 


NA 


NA 


222 


330 


605 


1,010 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



117.88 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



TABLE C504.2(6) 
EXTERIOR MASONRY CHIMNEY 



Number of Appliances 


Single 


Appliance Type 


NAT 


Appliance Vent Connection 


Type B double-wall connector 



MINIMUM ALLOWABLE INPUT RATING OF SPACE-HEATING APPLIANCE 
IN THOUSANDS OF BTU PER HOUR 


VENT HEIGHT 
(feet) 


Internal area of chimney (square Inches) 


12 


19 


28 


38 


50 


63 


78 


113 


37°F or Greater 






Local 99% Winter Design Temperature: 37°F or Greater 






6 


























8 


























10 


























15 


NA 























20 


NA 


NA 


123 


190 


249 


184 








30 


NA 


NA 


NA 


NA 


NA 


393 


334 





50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


579 


27 to 36°F 






Local 99% Winter Design Temperature: 27 to 36°F 






6 








68 


116 


156 


180 


212 


266 


8 








82 


127 


167 


187 


214 


263 


10 





51 


97 


141 


183 


201 


225 


265 


15 


NA 


NA 


NA 


NA 


233 


253 


274 


305 


20 


NA 


NA 


NA 


NA 


NA 


307 


330 


362 


30 


NA 


NA 


NA 


NA 


NA 


419 


445 


485 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


763 


17 to 26°F 






Local 99% Winter Design Temperature: 1 7 to 26°F 






6 


NA 


NA 


NA 


NA 


NA 


215 


259 


349 


8 


NA 


NA 


NA 


NA 


197 


226 


264 


352 


10 


NA 


NA 


NA 


NA 


214 


245 


278 


358 


15 


NA 


NA 


NA 


NA 


•NA 


296 


331 


398 


20 


NA 


NA 


NA 


NA 


NA 


352 


387 


457 


30 


NA 


NA 


NA 


NA 


NA 


NA 


507 


581 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


5 to 16°F 






Local 99% Winter Design Temperature: 5 to 16°F 






6 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


416 


8 


NA 


NA 


NA 


NA 


NA 


NA 


312 


423 


10 


NA 


NA 


NA 


NA 


NA 


289 


331 


430 


15 


NA 


NA 


NA 


NA 


NA 


NA 


393 


485 


20 


NA 


NA 


NA 


NA 


NA 


NA 


450 


547 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


682 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


972 


-10to4°F 






Local 99% Winter Design Temperature: -10 to 4°F 






6 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


484 


8 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


494 


10 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


513 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


586 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


650 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


805 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


1,003 


-11°F or Lower 






Local 99% Winter Design Temperature: -1 1°F or Lower 






Not recommended for any vent configurations 



Note: See Figure C-B-19 in Appendix C-B for a map showing local 99 percent winter design temperatures in the United States. 
For SI: °C = [(°F - 32]/1.8, 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.293 1 W 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.89 



APPENDIX C 



C5(D4.2.14 Table ieterpolation. Interpolation shall be 
permitted in calculating capacities for vent dimensions 
that fall between the table entries (see Example 3, Appen- 
dix B). 



€504.2,15 Extrapolatioini proMlbited., Extrapolation 
beyond the table entries shall not be permitted. 

€504.2.16 Eiigmeermg calculations. For vent heights less 
than 6 feet (1829 mm) and greater than shown in the tables, 
engineering methods shall be used to calculate vent capaci- 
ties. 



C504.3 Applicatioe of multiple appliance 
C504.3(l) through C504,3(7), The application of Tables 
C504.3(l) through C504.3(7) shall be subject to the require- 
ments of Sections C504.3.1 through C504.3.27. 

C504.3.1 Vent obstructions. These venting tables shall not 
be used where obstructions, as described in Section 
C503.15, are installed in the venting system. The installa- 
tion of vents serving listed appliances with vent dampers 
shall be in accordance with the appliance manufacturer's 
instructions or in accordance with the following: 

1 . The maximum capacity of the vent connector shall be 
determined using the NAT Max column. 

2. The maximum capacity of the vertical vent or chim- 
ney shall be determined using the FAN-i-NAT column 
when the second appliance is a fan-assisted appliance, 
or the NAT+NAT column when the second appliance 
is equipped with a draft hood. 

3. The minimum capacity shall be determined as if the 
appliance were a fan-assisted appliance. 

3.1. The minimum capacity of the vent connector 
shall be determined using the FAN Min col- 
umn. 

3.2. The FANh-FAN column shall be used where 
the second appliance is a fan-assisted appli- 
ance, and the FAN+NAT column shall be 
used where the second appliance is equipped 
with a draft hood, to determine whether the 
vertical vent or chimney configuration is not 
permitted (NA). Where the vent configuration 
is NA, the vent configuration shall not be per- 
mitted and an alternative venting configura- 
tion shall be utilized. 



€504.3.2 Connector length limit The vent connector shall 
be routed to the vent utilizing the shortest possible route. 
Except as provided in Section C504.3.3, the maximum vent 
connector horizontal length shall be VI2 feet for each inch 
(457 mm per mm) of connector diameter as shown in Table 
C504.3.2. 

C504.3,3 Connectors with longer lengths. Connectors 
with longer horizontal lengths than those listed in Section 
C504.3.2 are permitted under the following conditions: 

1 . The maximum capacity (FAN Max or NAT Max) of 
the vent connector shall be reduced 10 percent for 
each additional multiple of the length allowed by 
Section C504.3.2. For example, the maximum 
length listed in Table C504.3.2 for a 4-inch (102 



mm) connector is 6 feet (1829 mm). With a connec- 
tor length greater than 6 feet (1829 mm) but not 
exceeding 12 feet (3658 mm), the maximum capac- 
ity must be reduced by 10 percent (0.90 x maximum 
vent connector capacity). With a connector length 
greater than 12 feet (3658 mm) but not exceeding 18 
feet (5486 mm), the maximum capacity must be 
reduced by 20 percent (0.80 x maximum vent capac- 
ity). 

For a connector serving a fan-assisted appliance, the 
minimum capacity (FAN Min) of the connector shall 
be determined by referring to the corresponding sin- 
gle appliance table. For Type B double-wall connec- 
tors, Table C504.2(l) shall be used. For single- wall 
connectors. Table C504.2(2) shall be used. The 
height {H) and lateral (L) shall be measured according 
to the procedures for a single-appliance vent, as if the 
other appliances were not present. 



TABLE C504.3.2 
iWAXIMUfVi VENT CONNECTOR LENGTH 



CONNECTOR DIAMETER MAXIMUM 
(inches) 


CONNECTOR HORIZONTAL 
LENGTH (feet) 


3 


4V2 


4 


6 


5 


1% 


6 


9 


7 


1072 


8 


12 


9 


I3V2 


10 


15 


12 


18 


14 


21 


16 


24 


18 


27 


20 


30 


22 


33 


24 


36 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 

C504.3,4 Vent connector manifold. Where the vent con- 
nectors are combined prior to entering the vertical portion of 
the common vent to form a common vent manifold, the size 
of the common vent manifold and the common vent shall be 
determined by applying a 10-percent reduction (0.90 x 
maximum common vent capacity) to the common vent 
capacity part of the common vent tables. The length of the 
common vent connector manifold (L,„) shjill not exceed 1 Vj 
feet for each inch (457 mm per mm) of common vent con- 
nector manifold diameter (Z)) (see Figure C-B-1 1). 

C504.3.5 Common vertical vent offset. Where the com- 
mon vertical vent is offset, the maximum capacity of the 
common vent shall be reduced in accordance with Section 
C504.3.6. The horizontal length of the common vent offset 



117.90 



2007 OREGON RflECHANICAL SPECIALTY CODE 



APPENDIX C 



(LJ shallnot exceed IV2 feet for each inch (457 mm per 
mm) of common vent diameter. 

C5043.6 Elbows in vents. For each elbow up to and includ- 
ing 45 degrees (0.79 rad) in the common vent, the maximum 
common vent capacity listed in the venting tables shall be 
reduced by 5 percent. For each elbow greater than 45 
degrees (0.79 rad) up to and including 90 degrees (1 .57 rad), 
the maximum common vent capacity listed in the venting 
tables shall be reduced by 10 percent. 

C504.3.7 Elbows in connectors. The vent connector 
capacities listed in the common vent sizing tables include 
allowance for two 90-degree (1.57 rad) elbows. For each 
additional elbow up to and including 45 degrees (0.79 
rad), the maximum vent connector capacity listed in the 
venting tables shall be reduced by 5 percent. For each 
elbow greater than 45 degrees (0.79 rad) up to and includ- 
ing 90 degrees (1.57 rad), the maximum vent connector 
capacity listed in the venting tables shall be reduced by 10 
percent. 

C504.3.8 Common vent minimum size. The cross-sec- 
tional area of the common vent shall be equal to or greater 
than the cross-sectional area of the largest connector. 

C504.3.9 Common vent fittings. At the point where tee or 
wye fittings connect to a common vent, the opening size of 
the fitting shall be equal to the size of the common vent. 
Such fittings shall not be prohibited from having reduced- 
size openings at the point of connection of appliance vent 
connectors. 

C504,3.9.1 Tee and wye fittings. Tee and wye fittings 
connected to a common vent shall be considered as part 
of the common vent and shallbe constructed of materials 
consistent with that of the common vent. 

C504.3.10 High-altitude installations. Sea-level input rat- 
ings shall be used when determiiiing maximum capacity for 
high-altitude installation. Actual input (derated for altitude) 
shall be used for determining minimum capacity for 
high-altitude installation. 

C504.3.11 Connector rise measurement. Connector rise 
(R) for each appliance connector shall be measured from the 
draft hood outlet or flue collar to the centerline where the 
vent gas streams come together. 

C504.3.12 Vent height measurement. For multiple appli- 
ances all located on one floor, available total height (H) shall 
be measured from the highest draft hood outlet or flue collar 
up to the level of the outlet of the common vent. 

C504.3.13 Multistory height measurement. For multi- 
story installations, available total height (//) for each seg- 
ment of the system shall be the vertical distance between the 
highest draft hood outlet or flue: collar entering that segment 
and the centerline of the next higher interconnection tee (see 
Figure C-B- 13). 

C504.3.14 Multistory lowest portion sizing. The size of 
the lowest connector and of the vertical vent leading to the 
lowest interconnection of a multistory system shall be in 
accordance with Table C504.2(i) or C504.2(2) for available 



total height (H) up to the lowest interconnection (see Figure 
C-B-14). 

C504.3.15 Multistory common vents. Where used in mul- 
tistory systems, vertical common vents shall be Type B dou- 
ble wall and shall be installed with a listed vent cap. 

G504.3.16 Multistory common vent offsets. Offsets in 
multistory common vent systems shall be limited to a single 
offset in each system, and systems with an offset shall com- 
ply with all of the following: 

1. The offset angle shall not exceed 45 degrees (0.79 
rad) from vertical. 

2. The horizontal length of the offset shall not exceed 
1 V2 feet for each inch (457 mm per mm) of common 
vent diameter of the segment in which the offset is 
located. 

3. For the segment of the common vertical vent con- 
taining the offset, the common vent capacity listed in 
the common venting tables shall be reduced by 20 
percent (0.80 x maximum common vent capacity). 

4. A multistory common vent shall not be reduced in 
size above the offset. 

C504.3.17 Vertical vent maximum size. Where two or 
more appliances are connected to a vertical vent or chimney, 
the flow area of the largest section of vertical vent or chim- 
ney shall not exceed seven times the smallest listed appli- 
ance categorized vent areas, flue collar area, or draft hood 
outlet area unless designed in accordance with approved 
engineering methods. 

C504.3.18 Multiple input rate appliances. For appliances 
with more than one input rate, the minimum vent connector 
capacity (FAN Min) determined from the tables shall be less 
than the lowest appliance input rating, and the maximum 
vent connector capacity (FAN Max or NAT Max) deter- 
mined from the tables shall be greater than the highest appli- 
ance input rating. 

C504.3.19 Liner system sizing and connections. Listed, 
corrugated metallic chimney liner systems in masonry 
chimneys shall be sized by using Table C504.3(l) or 
C504.3(2) for Type B vents, with the maximum capacity 
reduced by 20 percent (0.80 x maximum capacity) and the 
minimum capacity as shown in Table C504.3(l) or 
C504.3(2). Corrugated metallic liner systems installed with 
bends or offsets shall have their maximum capacity further 
reduced in accordance with Sections C504.3.5 and 
C504.3.6. The 20-percent reduction for corrugated metallic 
chimney liner systems includes an allowance for one 
long-radius 90-degree (1.57 rad) turn at the bottom of the 
liner. Where double-wall connectors are required, tee and 
wye fittings used to connect to the common vent chimney 
liner shall be listed double- wall fittings. Connections 
between chimney liners and listed double- wall fittings shall 
be made with listed adapter fittings designed for such pur- 
pose. 

C504.3.20 Chimney and vent location. Tables C504.3(l), 
C504.3(2), C504.3(3), C504.3(4) and C504.3(5) shall only 
be used for chimneys and vents not exposed to the outdoors 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.91 



APPENDIX C 



below the roof line. A Type B vent or listed chimney lining 
system passing through an unused masonry chimney flue 
shall not be considered to be exposed to the outdoors. A 
Type B vent shall not be considered to be exposed to the out- 
doors where it passes through an unventilated enclosure or 
chase insulated to a value of not less than R8. 

Tables C504.3(6) and C504.3(7) shall be used for 
clay-tile-lined exterior masonry chimneys, provided all of 
the following conditions are met: 

1. Vent connector is Type B double wall. 

2. At least one appliance is draft hood equipped. 

3. The combined appliance input rating is less than the 
maximum capacity given by Table C504.3(6a) for 
NAT+NAT or Table C504.3(7a) for FAN+NAT. 

4. The input rating of each space-heating appliance is 
greater than the minimum input rating given by Table 
C504.3(6b) for NAT+NAT or Table C504.3(7b) for 
FAN+NAT. 

5 . The vent connector sizing is in accordance with Table 

C504.3(3). 

Where these conditions cannot be met, an alternative 
venting design shall be used, such as a listed chimney lining 
system. 

Exception: Vents serving listed appliances installed in 
accordance with the appliance manufacturer's installa- 
tion instructions. 

C5®4.3<,21 Coraiector maximum and minimum size. 
Vent connectors shall not be increased in size more than two 
sizes greater than the listed appliance categorized vent 
diameter, flue collar diameter, or draft hood outlet diameter. 
Vent connectors for draft hood-equipped appliances shall 
not be smaller than the draft hood outlet diameter. Where a 
vent connector size(s) determined from the tables for a 
fan-assisted appliance(s) is smaller than the flue collar 
diameter, the use of the smaller size(s) shall be permitted 
provided that the installation complies with all of the fol- 
lowing conditions: 

1 . Vent connectors for fan-assisted appliance flue col- 
lars 12 inches (305 mm) in diameter or smaller are not 
reduced by more than one table size [e.g., 12 inches to 
10 inches (305 mm to 254 mm) is a one-size reduc- 
tion] and those larger than 12 inches (305 mm) in 
diameter are not reduced more than two table sizes 
[e.g., 24 inches to 20 inches (610 mm to 508 mm) is a 
two-size reduction]. 

2. The fan-assisted appliance(s) is common vented with 
a draft-hood-equipped appliances(s). 

3. The vent connector has a smooth interior wall. 

C5®4.3.22 Component commingling. All combinations of 
pipe sizes, single- wall and double- wall metal pipe shall be 
allowed within any connector run(s) or within the common 
vent, provided that all of the appropriate tables permit all of 
the desired sizes and types of pipe, as if they were used for 
the entire length of the subject connector or vent. Where sin- 
gle-wall and Type B double-wall metal pipes are used for 



vent connectors within the same venting system, the com- 
mon vent must be sized using Table C504.3(2) or 
C504.3(4), as appropriate. 

C504.3.23 Draft hood conversion accessories. Draft hood 
conversion accessories for use with masonry chimneys 
venting listed Category I fan-assisted appliances shall be 
listed and installed in accordance with the manufacturer's 
installation instructions for such listed accessories. 

C504.3.24 Multiple sizes permitted. Where a table per- 
mits more than one diameter of pipe to be used for a connec- 
tor or vent, all the permitted sizes shall be permitted to be 
used. 

C504.3.25 Table interpolation. Interpolation shall be per- 
mitted in calculating capacities for vent dimensions that fall 
between table entries (see Appendix B, Example 3). 

C504.3.26 Extrapolation prohibited. Extrapolation 
beyond the table entries shall not be permitted. 

C5043.27 Engineering calculations. For vent heights less 
than 6 feet (1829 mm) and greater than shown in the tables, 
engineering methods shall be used to calculate vent capaci- 
ties. 



SECTION C505 

DIRECT-VENT, INTEGRAL VENT, 

I\/1ECHANICAL VENT AND 

VENTILATION/EXHAUST HOOD VENTING 

C505.1 General. The installation of direct- vent and integral 
vent appliances shall be in accordance with Section C503. 
Mechanical venting systems shall be designed and installed 
in accordance with Section C503. Exhaust hood venting 
used in conjunction with commercial cooking operations 
shall be designed and installed in accordance with Section 
507. 



SECTION C506 

FACTORY-BUILT CHIMNEYS 

C506.1 Building heating appliances. Factory-built chim- 
neys for building heating appliances producing flue gases 
having a temperature not greater than 1,000°F (538°C), mea- 
sured at the entrance to the chimney, shall be listed and 
labeled in accordance with UL 103 and shall be installed and 
terminated in accordance with the manufacturer's installation 
instructions. 

C506,2 Support. Where factory-built chimneys are supported 
by structural members, such as joists and rafters, such mem- 
bers shall be designed to support the additional load. 

C506.3 Medium-heat appliances. Factory-built chinmeys for 
medium-heat appliances producing flue gases having a tem- 
perature above 1,000°F (538°C), measured at the entrance to 
the chimney, shall be listed and labeled in accordance with UL 
959 and shall be installed and terminated in accordance with 
the manufacturer's installation instructions. 



< 



< 



117.92 



2007 OREGON MECHANICAL SPECIALTY CODE 



APPENDIX C 



TABLE C504.3(1) 
TYPE B DOUBLE-WALL VENT 



Number of Appliances 


Two or more 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double-wall connector 



VENT CONNECTOR CAPACITY 



VENT 
HEIGHT 

(H) 
(feet) 


CONNECTOR 
RISE 

(fl) 
(feet) 


TYPE B DOUBLE-WALL VENT AND CONNECTOR DIAMETER— (0) inches 


3 


4 


5 


6 


7 


8 


9 


10 


APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


MIn 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


MIn 


Max 


Max 


Min 


Max 


Max 


MIn 


Max 


Max 


6 


1 


22 


37 


26 


35 


66 


46 


46 


106 


72 


58 


164 


104 


77 


225 


142 


92 


296 


185 


109 


376 


237 


128 


466 


289 


2 


23 


41 


31 


37 


75 


55 


48 


121 


86 


60 


183 


124 


79 


253 


168 


95 


333 


220 


112 


424 


282 


131 


526 


345 


3 


24 


44 


35 


38 


81 


62 


49 


132 


96 


62 


199 


139 


82 


275 


189 


97 


363 


248 


114 


463 


317 


134 


575 


386 


8 


1 


22 


40 


27 


35 


72 


48 


49 


114 


76 


64 


176 


109 


84 


243 


148 


100 


320 


194 


118 


408 


248 


138 


507 


303 


2 


23 


44 


32 


36 


80 


57 


51 


128 


90 


66 


195 


129 


86 


269 


175 


103 


356 


230 


121 


454 


294 


141 


564 


358 


3 


24 


47 


36 


37 


87 


64 


53 


139 


101 


67 


210 


145 


88 


290 


198 


105 


384 


258 


123 


492 


330 


143 


612 


402 


10 


1 


22 


43 


28 


34 


78 


50 


49 


123 


78 


65 


189 


113 


89 


257 


154 


106 


341 


200 


125 


436 


257 


146 


542 


314 


2 


23 


47 


33 


36 


86 


59 


51 


136 


93 


67 


206 


134 


91 


282 


182 


109 


374 


238 


128 


479 


305 


149 


596 


372 


3 


24 


50 


37 


37 


92 


67 


52 


146 


104 


69 


220 


150 


94 


303 


205 


111 


402 


268 


131 


515 


342 


152 


642 


417 


15 


1 


21 


50 


30 


33 


89 


53 


47 


142 


83 


64 


220 


120 


88 


298 


163 


110 


389 


214 


134 


493 


273 


162 


609 


333 


2 


22 


53 


35 


35 


96 


63 


49 


153 


99 


66 


235 


142 


91 


320 


193 


112 


419 


253 


137 


532 


323 


165 


658 


394 


3 


24 


55 


40 


36 


102 


71 


51 


163 


HI 


68 


248 


160 


93 


339 


218 


115 


445 


286 


140 


565 


365 


167 


700 


444 


20 


1 


21 


54 


31 


33 


99 


56 


46 


157 


87 


62 


246 


125 


86 


334 


171 


107 


436 


224 


131 


552 


285 


158 


681 


347 


2 


22 


57 


37 


34 


105 


66 


48 


167 


104 


64 


259 


149 


89 


354 


202 


110 


463 


265 


134 


587 


339 


161 


725 


414 


3 


23 


60 


42 


35 


110 


74 


50 


176 


116 


66 


271 


168 


91 


371 


228 


113 


486 


300 


137 


618 


383 


164 


764 


466 


30 


1 


20 


62 


33 


31 


113 


59 


45 


181 


93 


60 


288 


134 


83 


391 


182 


103 


512 


238 


125 


649 


305 


151 


802 


372 


2 


21 


64 


39 


33 


118 


70 


47 


190 


110 


62 


299 


158 


85 


408 


215 


105 


535 


282 


129 


679 


360 


155 


840 


439 


3 


22 


66 


44 


34 


123 


79 


48 


198 


124 


64 


309 


178 


88 


423 


242 


108 


555 


317 


132 


706 


405 


158 


874 


494 


50 


1 


19 


71 


36 


30 


133 


64 


43 


216 


101 


57 


349 


145 


78 


477 


197 


97 


627 


257 


120 


797 


330 


144 


984 


403 


2 


21 


73 


43 


32, 


137 


76 


45 


223 


119 


59 


358 


172 


81 


490 


234 


100 


645 


306 


123 


820 


392 


148 


1,014 


478 


3 


22 


75 


48 


33 


141 


86 


46 


229 


134 


61 


366 


194 


83 


502 


263 


103 


661 


343 


126 


842 


441 


151 


1,043 


538 


100 


1 


18 


82 


37 


28 


158 


66 


40 


262 


104 


53 


442 


150 


73 


611 


204 


91 


810 


266 


112 


1,038 


341 


135 


1,285 


417 


2 


19 


83 


44 


30 


161 


79 


42 


267 


123 


55 


447 


178 


75 


619 


242 


94 


822 


316 


115 


1,054 


405 


139 


1,306 


494 


3 


20 


84 


50 


31 


163 


89 


44 


272 


138 


57 


452 


109 


78 


627 


272 


97 


834 


355 


118 


1,069 


455 


142 


1,327 


555 



COMMON VENT CAPACITY 



VENT 
HEIGHT 

(H) 
(feet) 


TYPE B DOUBLE-WALL COMMON VENT DIAMETER (D)— inches 


4 


5 


6 


7 


8 


= 


10 


COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


6 


92 


81 


65 


140 


116 


103 


204 


161 


147 


309 


248 


200 


404 


314 


260 


547 


434 


335 


672 


520 


410 


8 


101 


90 


73 


155 


129 


114 


224 


178 


163 


339 


275 


223 


444 


348 


290 


602 


480 


378 


740 


577 


465 


10 


110 


97 


79 


169 


141 


124 


243 


194 


178 


367 


299 


242 


477 


377 


315 


649 


522 


405 


800 


627 


495 


15 


125 


112 


91 


195 


164 


144 


283 


228 


206 


427 


352 


280 


556 


444 


365 


753 


612 


465 


924 


733 


565 


20 


136 


123 


102 


215 


183 


160 


314 


255 


229 


475 


394 


310 


621 


499 


405 


842 


688 


523 


1,035 


826 


640 


30 


152 


138 


118 


244 


210 


185 


361 


297 


266 


547 


459 


360 


720 


585 


470 


979 


808 


605 


1,209 


975 


740 


50 


167 


153 


134 


279 


244 


214 


421 


353 


310 


641 


547 


423 


854 


706 


550 


1,164 


977 


705 


1,451 


1,188 


860 


100 


175 


163 


NA 


311 


277 


NA 


489 


421 


NA 


751 


658 


479 


1,025 


873 


625 


1,408 


1,215 


800 


1,784 


1,502 


975 



(continued) 



2007 OREGON MECHANICAL SPECIALTY CODE 



117.93 



APPENDIX C 



TABLE C504.3(1)— continued 
TYPE B DOUBLE-WALL VENT 



Number of Appliances 


Two or more 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double-wall connector 



VENT CONNECTOR CAPACITY 



VENT 
HEIGHT 

(H) 
(feet) 


CONNECTOR 
RISE 

(«) 
(feet) 


TYPE B DOUBLE-WALL VENT AND DIAMETER— (0) inches 


12 


14 


16 


18 


20 


22 


24 


APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max